Qualification: 
Ph.D
naveenvkulkarni@am.amrita.edu

Dr. Naveen V. Kulkarni currently serves as Assistant Professor (Sr. Gr.) at the Department of Chemistry, Amrita School of Arts and Sciences, Amritapuri. He completed his Masters degree in Physical Chemistry from Karnatak University Dharwad with first rank and received a gold medal (2006). After accepting the Nilekani Fellowship he joined Prof. V. K. Revankar at Department of Chemistry, Karnatak University Dharwad for his doctoral studies in the field of transition metal coordination chemistry (2006 – 2010). He has worked with renowned organometallic chemists, Prof. Moris S. Eisen (Technion – Haifa, Israel 2010 – 2013), Prof. H. V. Rasika Dias (UTA – Arlington, United States 2013 - 2016) and Prof. William D. Jones (University of Rochester, United States, 2016 – 2017) for his postdoctoral research experience and contributed in development of several new valuable catalysts and methodologies.

Naveen joined the Department of Chemistry at Amrita in 2017. His current research interests include Coordination Chemistry, Organometallic Chemistry, Catalysis and Sustainable Chemistry.

AWARDS/ACHIEVEMENTS  

  • Fellowship by NSF (CENTC) to carry out research at University of Rochester, NY, United States (2016 – 2017).
  • Postdoctoral fellowship by NSF to carry out research at UT Arlington, United States (2013-2016).
  • The Schulich postdoctoral fellowship at Technion, Haifa, Israel (2010-2013).
  • ‘Nilekani Fellowship’ to pursue PhD studies at Karnatak University Dharwad (2006-2010).
  • Recipient of Prof. E. S. Jayadevappa’s 60th Birthday commemorative ‘Gold Medal’ for securing ‘I Rank’ in M. Sc. Physical chemistry in 2006.
  • ‘Best Student’ award from the KLE’s J. T. College, Gadag during Bachelor’s studies in 2004.
  • ‘Best Social Worker’ award from the NSS unit of K.L.E’s J. T. College, Gadag, for two conjugative years during Bachelor’s studies (2001 to 2004).
     

Professional Roles

  • Serving as a reviewer for Journal of American Chemical Society, Journal of Coordination Chemistry and Spectrochimica Acta Part – A.
  •  Serving as an Editorial Board Member of International Journal of Chemical and Physical Sciences, India.

Publications

Publication Type: Journal Article

Year of Conference Publication Type Title

2017

Journal Article

S. G. Ridlen, Dr. Naveen V. Kulkarni, and Dias, H. V. Rasika, “Monoanionic, Bis(pyrazolyl)methylborate [(Ph3B)CH(3,5-(CH3)2Pz)2)]− as a Supporting Ligand for Copper(I)-ethylene, cis-2-Butene, and Carbonyl Complexes”, Inorganic Chemistry, vol. 56, pp. 7237-7246, 2017.[Abstract]


The monoanionic bidentate ligand [(Ph3B)CH(3,5-(CH3)2Pz)2)]− has been prepared from lithium bis(pyrazolyl)methanide and triphenylborane. This useful new ligand is closely related to the well-established bis(pyrazolyl)borate and bis(pyrazolyl)methane ligands but has key differences to both analogues as well. The ethylene, cis-2-butene, and carbon monoxide adducts [(Ph3B)CH(3,5-(CH3)2Pz)2]Cu(L) (where L = C2H4, cis-CH3HC═CHCH3, and CO) have been prepared from [(Ph3B)CH(3,5-(CH3)2Pz)2)]Li(THF), copper(I) triflate, and the corresponding coligand. These complexes have been characterized by NMR spectroscopy and X-ray crystallography. In all cases the bis(pyrazolyl) moiety is bound in κ2N fashion with the BPh3 group rotated to sit over the metal center, sometimes coordinating to the metal via phenyl carbons as in [(Ph3B)CH(3,5-(CH3)2Pz)2)]Li(THF) and [(Ph3B)CH(3,5-(CH3)2Pz)2]Cu(CO) or simply hovering above the metal site as in [(Ph3B)CH(3,5-(CH3)2Pz)2)]Cu(C2H4) and [(Ph3B)CH(3,5-(CH3)2Pz)2)]Cu(cis-CH3HC═CHCH3). The 13C and 1H resonances of the ethylene carbon and protons of [(Ph3B)CH(3,5-(CH3)2Pz)2)]Cu(C2H4) appear at δ 81.0 and 3.71 ppm in CD2Cl2, respectively. The characteristic CO frequency for [(Ph3B)CH(3,5-(CH3)2Pz)2]Cu(CO) has been observed at υ̅ 2092 cm–1 by infrared spectroscopy and is lower than that of free CO suggesting moderate M → CO π-back-donation. A detailed analysis of these complexes has been presented herein.

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2017

Journal Article

S. G. Ridlen, Dr. Naveen V. Kulkarni, and Dias, H. V. Rasika, “Partially fluorinated Scorpionate [HB(3-(CF3),5-(Ph)Pz)3]− as a supporting ligand for silver(I)-benzene, -carbonyl, and -PPh3 complexes”, Polyhedron, vol. 125, pp. 68 - 73, 2017.[Abstract]


Abstract The benzene, CO, and \{PPh3\} adducts [HB(3-(CF3),5-(Ph)Pz)3]AgL (L = C6H6, CO, or PPh3) have been synthesized by a metathesis process using [HB(3-(CF3),5-(Ph)Pz)3]Na(THF), CF3SO3Ag, and the corresponding co-ligands. These silver(I) adducts have been characterized by \{NMR\} spectroscopy, and by X-ray crystallography. In all cases the Scorpionate is bound to silver in typical κ3-fashion. The X-ray crystallographic data of [HB(3-(CF3),5-(Ph)Pz)3]Ag(η2-C6H6) show that it has a η2-bound benzene molecule. \{NMR\} data point to fluxional behavior in solution. The 13C \{NMR\} resonance corresponding to the \{CO\} moiety of [HB(3-(CF3),5-(Ph)Pz)3]Ag(CO) appears as a single peak at δ 177.4 ppm and the ν ¯ co is observed at 2148 cm−1. These values indicate the presence of a fairly Lewis acidic silver atom in [HB(3-(CF3),5-(Ph)Pz)3]Ag(CO) and significantly diminished Ag → \{CO\} π-backbonding. Interesting coupling is observed in the solution 19F and 31P \{NMR\} spectra of the Ag(I) adduct [HB(3-(CF3),5-(Ph)Pz)3]Ag(PPh3). A detailed analysis of the spectral and structural features of these complexes has been described herein

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2016

Journal Article

H. V. Rasika Dias and Dr. Naveen V. Kulkarni, “The silver (I) complex [HB $\$3-(CF3), 5-(CH3) Pz$\$ 3] AgNCCH3 supported by a partially fluorinated scorpionate ligand”, Acta Crystallographica Section C: Structural Chemistry, vol. 72, pp. 853–856, 2016.[Abstract]


Tris(pyrazol­yl)borates are used extensively in metal coordination chemistry and belong to a class of ligands generally referred to as scorpionates. The steric and electronic properties of these ligands can be modified quite easily by varying the substituents on the 3-, 4-, and 5-positions of the pyrazolyl moieties on the B atom. Fluorinated tris­(pyrazol­yl)borates are useful in the stabilization of rare silver(I) complexes. The silver(I) adduct (aceto­nitrile-[kappa]N){tris[5-methyl-3-(tri­fluoro­meth­yl)pyrazol-1-yl-[kappa]N2]hydro­borato}silver(I), [Ag(C15H13BF9N6)(CH3CN)] or [HB{3-(CF3),5-(CH3)Pz}3]AgNCCH3, was ob­tained by treating [HB{3-(CF3),5-(CH3)Pz}3]Na with CF3SO3Ag in the presence of aceto­nitrile, and was isolated in 85% yield. Single-crystal X-ray diffraction analysis reveals that the AgI center has a pseudo-tetra­hedral all-nitro­gen coordination sphere, and is supported by a tris­(pyrazol­yl)borate ligand that binds to the AgI center in a [kappa]3-fashion.

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2016

Journal Article

Dr. Naveen V. Kulkarni, Das, A., Ridlen, S., K., V. A., Adiraju, M. Yosufuddin, and Rasika, H. V., “Triazapentadienyl Supported Zinc (II) Ethyl Complexes: Reaction with Dioxygen and Catalytic Application in the Thischenko Reaction”, Dalton Trans, vol. 45, pp. 4896-4906, 2016.

2016

Journal Article

S. G. Ridlen, Wu, J., Dr. Naveen V. Kulkarni, and Dias, H. V. Rasika, “Isolable Ethylene Complexes of Copper(I), Silver(I), and Gold(I) Supported by Fluorinated Scorpionates [HB3-(CF3),5-(CH3)Pz3]– and [HB3-(CF3),5-(Ph)Pz3]–”, European Journal of Inorganic Chemistry, vol. 2016, pp. 2573–2580, 2016.[Abstract]


The group 11 metal adducts [HB{3-(CF3),5-(CH3)Pz}3]M(C2H4) (M = Au, Ag, and Cu; Pz = pyrazolyl) have been synthesized via a metathesis process using [HB{3-(CF3),5-(CH3)Pz}3]Na and CF3SO3Cu, CF3SO3Ag, AuCl and ethylene. The related [HB{3-(CF3),5-(Ph)Pz}3]Ag(C2H4) has also been synthesized using [HB{3-(CF3),5-(Ph)Pz}3]Na(THF), CF3SO3Ag and ethylene. These group 11 metal ethylene complexes are white solids and form colorless crystals. They have been characterized by NMR spectroscopy and X-ray crystallography. The gold-ethylene adduct [HB{3-(CF3),5-(CH3)Pz}3]Au(C2H4) shows large upfield NMR shifts of the ethylene proton and carbon signals relative to the corresponding peaks of the free ethylene, indicating relatively high Au→ethylene backbonding. NMR chemical shift data suggest that the silver complexes of both the tris(pyrazolyl)borate ligands [HB{3-(CF3),5-(CH3)Pz}3]– and [HB{3-(CF3),5-(Ph)Pz}3]– exhibit the weakest interaction with ethylene as compared to the respective copper and gold complexes. X-ray crystal structures reveal that the gold atom in [HB{3-(CF3),5-(CH3)Pz}3]Au(C2H4) binds to scorpionate in κ2-fashion while the related silver adduct features a κ3-bonded scorpionate. [HB{3-(CF3),5-(CH3)Pz}3]Cu(C2H4) has a scorpionate that binds to copper with two short Cu–N bonds and one long Cu–N distance.

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2015

Journal Article

Dr. Naveen V. Kulkarni, Dash, C., Jayaratna, N. B., Ridlen, S. G., Khani, S. Karbalaei, Das, A., Kou, X., Yousufuddin, M., Cundari, T. R., and Dias, H. V. Rasika, “Zinc(II)-Mediated Carbene Insertion into C–H Bonds in Alkanes”, Inorganic Chemistry, vol. 54, pp. 11043-11045, 2015.[Abstract]


The cationic zinc adduct {[HB(3,5-(CF3)2Pz)3]Zn(NCMe)2}ClO4 catalyzes the functionalization of tertiary, secondary, and primary C–H bonds of alkanes via carbene insertion. Ethyl diazoacetate serves as the :CHCO2Et carbene precursor. The counteranion, supporting ligand, and coordinating solvents affect the catalytic activity. An in situ generated {[HB(3,5-(CF3)2Pz)3]Zn}+ species containing a bulkier {B[3,5-(CF3)2C6H3]4}− anion gives the best results among the zinc catalysts used.

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2015

Journal Article

Dr. Naveen V. Kulkarni, Das, A., Jayaratna, N. B., Yousufuddin, M., and Dias, H. V. Rasika, “Zinc-Mediated Carbene Insertion to C–Cl Bonds of Chloromethanes and Isolable Zinc(II) Isocyanide Adducts”, Inorganic Chemistry, vol. 54, pp. 5151-5153, 2015.[Abstract]


The zinc adduct {[HB(3,5-(CF3)2Pz)3]Zn}+, which was generated from [HB(3,5-(CF3)2Pz)3]ZnEt and [Ph3C]{B[3,5-(CF3)2C6H3]4}, catalyzes the activation of C–halogen bonds of chloromethanes via carbene insertion. Ethyl diazoacetate serves as the carbene precursor. The presence of {[HB(3,5-(CF3)2Pz)3]Zn}+ in the reaction mixture was confirmed by obtaining {[HB(3,5-(CF3)2Pz)3]Zn(CNtBu)3}+ using CNtBu as a trapping agent. {[HB(3,5-(CF3)2Pz)3]Zn(CNtBu)3}+ loses one zinc-bound CNtBu easily to produce five-coordinate {[HB(3,5-(CF3)2Pz)3]Zn(CNtBu)2}+.

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2014

Journal Article

Dr. Naveen V. Kulkarni, Elkin, T., Tumnisky, B., Shimon, L. J. W., Botoshansky, M., and Eisen, M. S., “Group IV complexes of asymmetric amidinate ligands Synthesis, Characterization, and Their Catalytic Activity in the Polymerization of α-Olefins”, Organometallics, vol. 33, no. 12, pp. 3119–3136, 2014.

2013

Journal Article

T. Elkin, Dr. Naveen V. Kulkarni, Tumanskii, B., Botoshansky, M., Shimon, L. J. W., and Eisen, M. S., “Synthesis and Structure of Group 4 Symmetric Amidinate Complexes and Their Reactivity in the Polymerization of α-Olefins”, Organometallics, vol. 32, pp. 6337-6352, 2013.[Abstract]


The steric properties of various nitrogen substituents on amidines were tuned in order to obtain group 4 mono- and bis(amidinate) dimethylamido or chloride complexes. The amidinate dimethylamido and chloride complexes were prepared, and their solid-state as well as their solution-state structures were studied. After the activation by MAO, these complexes were tested in the polymerization of propylene and ethylene. A noticeable influence of the amidine carbon and nitrogen substituents on the activity of the catalyst and properties of the obtained polymer was observed. Further, a plausible mechanism for the ethylene polymerization process is presented taking into account a combination of ESR-C60 and MALDI-TOF experiments, shedding light on the nature of the catalytic species.

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2013

Journal Article

Dr. Naveen V. Kulkarni, Aharonovich, S., Zhang, J. - S., Botoshansky, M., Kapon, M., and Eisen, M. S., “Polymerization of Propylene Promoted by new Zirconium Amidinates”, Dalton Trans, vol. 42, 2013.

2012

Journal Article

Dr. Naveen V. Kulkarni, Revankar, V. K., Kirasur, B. N., and Hugar, M. H., “Transition metal complexes of thiosemicarbazones with quinoxaline hub: an emphasis on antidiabetic property”, Medicinal Chemistry Research, vol. 21, pp. 663–671, 2012.[Abstract]


New transition metal complexes of quinoxaline–thiosemicarbazone ligands were prepared and characterised by spectroanalytical techniques. The ligands L1H2 and L2H2 were obtained by the reaction of quinoxaline-2.3(1,4H)-dione with methyl and phenyl thiosemicarbazide, respectively. All the complexes are found to be monomeric in nature and have tetrahedral geometry. The copper complexes have shown redox responses in the applied voltage range, whereas the ligands and other complexes are electrochemically innocent. The ligands, copper and zinc complexes are explored for antidiabetic activity in the diabetes-induced Wister rats. Evaluation of antidiabetic activity was done by blood-glucose test and oral glucose tolerance test; few compounds have exhibited significant antidiabetic activity and posses low toxicity with a high safety profile.

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2012

Journal Article

G. S. Kurdekar, Sathisha, M. P., Budagumpi, S., Dr. Naveen V. Kulkarni, Revankar, V. K., and Suresh, D. K., “4-Aminoantipyrine-based Schiff-base transition metal complexes as potent anticonvulsant agents”, Medicinal Chemistry Research, vol. 21, pp. 2273–2279, 2012.[Abstract]


Metal complexes of Co(II), Ni(II), Cu(II), and Zn(II) with ligands (L1H and L2) derived from 4-aminoantipyrine, 2-hydroxy-3-formylquinoline, and isatin were synthesized and characterized by the elemental analysis, conductance measurements, magnetic susceptibility, and spectral analysis. The spectral data revealed that the ligands acted as a neutral tridentate, coordinating to the metal ion through the azomethine nitrogen, phenolic oxygen, and carbonyl oxygen of the 4-aminoantipyrine, 2-hydroxy-3-formylquinoline, and isatin molecule in ligands L1H and L2 only. Both the ligands and their metal complexes were studied for cyclic voltammetry studies. The ligand and the metal complexes were screened for their anticonvulsant activity, and it has been observed that the metal complexes are more potent than the ligands.

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2011

Journal Article

Dr. Naveen V. Kulkarni, Kamath, A., Budagumpi, S., and Revankar, V. K., “Pyrazole bridged binuclear transition metal complexes: Synthesis, characterization, antimicrobial activity and DNA binding/cleavage studies”, Journal of Molecular Structure, vol. 1006, pp. 580 - 588, 2011.[Abstract]


A new ligand system having pyrazolato endogenous bridging component and N4S2 donating sites is synthesized by the condensation of 3,5-dichloroformyl-1H-pyrazole with phenylthiosemicarbazide. Both ligand and its binuclear CoII, NiII, CuII and ZnII complexes are characterized by the spectral and analytical methods. All the complexes were found to be binuclear monomeric in nature with octahedral geometry and nonelectrolytes. Electrochemical activity is observed only for the CuII complex in the applied potential range. Ligand and complexes were screened for antimicrobial activity and made to interact with Escherichia coli DNA to investigate the binding/cleaving ability by absorption, hydrodynamic, thermal denaturation and electrophoresis studies. The copper complex exhibited higher inhibition against a gram negative bacterium, E. coli and shown good intercalating ability with E. coli DNA.

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2011

Journal Article

A. Kamath, Dr. Naveen V. Kulkarni, Netalkar, P. P., and Revankar, V. K., “Phenoxide bridged tetranuclear Co(II), Ni(II), Cu(II) and Zn(II) complexes: Electrochemical, magnetic and antimicrobial studies”, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, vol. 79, pp. 1418 - 1424, 2011.[Abstract]


Phenoxide bridged later first row transition metal(II) complexes have been prepared by the interaction of later 3d transition metal(II) chlorides with tetranucleating compartmental Schiff base ligand system derived from 2,6-diformyl-4-methylphenol, p-phenylenediamine and 2-hydrazinobenzothiazole. Ligand and complexes were characterized by analytical, spectral (IR, UV–visible, ESR, FAB-mass and fluorescence), magnetic and thermal studies. All complexes are found to have octahedral geometry. The mutual influence of metal centres in terms of cooperative effect on the electronic, magnetic, electrochemical and structural properties was investigated. The Schiff base and its complexes have been screened for their antibacterial (against Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa) and antifungal activities (against Aspergillus niger, and Candida albicans).

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2011

Journal Article

S. Budagumpi, Dr. Naveen V. Kulkarni, Sathisha, M. P., Netalkar, S. P., Revankar, V. K., and Suresh, D. K., “Exploration on structure and anticonvulsant activity of transition metal complexes derived from an ``end-off'' compartmental bis-quinoxaline derivative with phthalazinyl-diazine as endogenous bridge”, Monatshefte für Chemie - Chemical Monthly, vol. 142, p. 487, 2011.[Abstract]


An oligoquinoxaline derivative with phthalazine core has been prepared by condensation of 1,4-dihydrazinophthalazine with 2,3-dichloroquinoxaline in dry ethanol followed by acid hydrolysis. Classical endogenous bridging of phthalazine core with its diazine fragment was established in the transition metal(II) complexes derived from the ligand system by using various physicochemical and spectral techniques. The organic host acts as a hexadentate chelate with N4O2 donating sites for coordination towards later first-row transition metal ions. Complexes are in good agreement with the octahedral geometry and found to be 1:1 electrolytes. All synthesized compounds were screened for anticonvulsant activity in Wistar rats by using maximal electroshock method. The ligand, and Co(II) and Ni(II) complexes show appreciable suppression towards electroshock-induced seizures.

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2011

Journal Article

M. P. Sathisha, Dr. Naveen V. Kulkarni, Budagumpi, S., Kirasur, B. N., and Revankar, V. K., “Coordination chemistry of a new tetranucleating 26-membered polyaza macropolycyclic ligand and a novel phenolate/phthalazine-bridged copper(II) and zinc(II) complexes”, Supramolecular Chemistry, vol. 23, pp. 342-350, 2011.[Abstract]


The novel phenol and phthalazine-based symmetric compartmental 26-membered polyaza macropolycyclic ligand LH2, was synthesised, incorporating 2,6-diformyl-p-cresol and 1,4-dihydrazinophthalazine via 1:1 condensation. Its coordination behaviour with CuII and ZnII ions was investigated. The tetranuclear complexes [M4μ(Cl2)(L)Cl4]·2H2O exhibited aremarkably high stability, suggesting that, along with the large number of nitrogen donors available for metal binding, deprotonated phenolic functions were also involved in binding the metal ion. Incorporation of the bridging units into the macrocyclic cavity influenced electronic communications between the metal ions.

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2011

Journal Article

Dr. Naveen V. Kulkarni and Revankar, V. K., “Synthesis, antimicrobial screening, and DNA-binding/cleavage of new pyrazole-based binuclear CoII, NiII, CuII, and ZnII complexes”, Journal of Coordination Chemistry, vol. 64, pp. 725-741, 2011.[Abstract]


Pyrazolato endogenous bridged binuclear CoII, NiII, CuII, and ZnII complexes were prepared and characterized by spectro-analytical methods. The hexadentate N4S2 donor was synthesized by condensation of 3,5-dichloroformyl-1H-pyrazole with thiosemicarbazide in dry ethanol. All the complexes were binuclear and octahedral in nature. The ligand and complexes are screened for antimicrobial and DNA-binding/cleavage activities. The binding/cleavage activities with Escherichia coli DNA are monitored with absorption, hydrodynamic, thermal denaturation, and electrophoresis studies. The ligand possesses significant activity against microbes which is further enhanced upon complexation. The DNA-binding study reveals classical intercalation. The NiII and CuII complexes exhibit higher binding ability.

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2011

Journal Article

G. S. Kurdekar, Puttanagouda, S. Mudigoudar, Dr. Naveen V. Kulkarni, Budagumpi, S., and Revankar, V. K., “Synthesis, characterization, antibiogram and DNA binding studies of novel Co(II), Ni(II), Cu(II), and Zn(II) complexes of Schiff base ligands with quinoline core”, Medicinal Chemistry Research, vol. 20, pp. 421–429, 2011.[Abstract]


A series of Co(II), Ni(II), Cu(II), and Zn(II) complexes of Schiff base ligands L1H3 and L2H have been prepared. The ligands are synthesized by the condensation of 2-hydroxy-3-formylquinoline with salicyloylhydrazide and 2-hydrazinobenzothiazole in absolute ethanol. The prepared complexes were characterized by the analytical and spectral techniques. The stoichiometry of the complexes is found to be 1:1. The presence of coordinated and lattice water is confirmed by the TG and DTA studies. Subsequently all the prepared complexes were screened for antimicrobial activity against bacteria and fungi. The Cu(II) complexes have been found to be more active than the ligand. In addition the DNA binding/cleaving capacity of the compounds was analyzed by absorption spectroscopy, viscosity measurement, thermal denaturation, and gel electrophoresis methods.

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2010

Journal Article

Dr. Naveen V. Kulkarni, Bevinahalli, N. H., and Revankar, V. K., “Ligational behaviour of novel S, N and O donor quinoxaline derivatives towards the later first row transition metal ions”, J. Coord. Chem, vol. 63, 2010.

2010

Journal Article

S. Budagumpi, Dr. Naveen V. Kulkarni, Kurdekar, G. S., Sathisha, M. P., and Revankar, V. K., “Synthesis and spectroscopy of CoII, NiII, CuII and ZnII complexes derived from 3,5-disubstituted-1H-pyrazole derivative: A special emphasis on DNA binding and cleavage studies”, European Journal of Medicinal Chemistry, vol. 45, pp. 455 - 462, 2010.[Abstract]


A series of novel CoII, NiII, CuII and ZnII complexes of 1H-pyrazole-3,5-dicarboxylic(2′-hydroxy-3′-hydrazinequinoxaline) has been prepared and characterized by the spectral and analytical techniques. CuII ion reacts with the ligand LH3 and forms the complex in one compartment of the ligand whereas, the other compartment remains free. In CoII, NiII and ZnII complexes both compartments of LH3 are involved in the coordination. DNA binding/cleavage studies were revealed the stronger binding capability of the present NiII complex, confirmed by the absorbance, viscometric and gel-electrophoresis studies. Similarly, remaining complexes do the same in the ligand field with lesser binding constants, subsequently, no complex was found to cleave the DNA. Finally, CuII complex shows growth inhibitory activity against biogram.

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2010

Journal Article

Dr. Naveen V. Kulkarni, Kurdekar, G. S., Budagumpi, S., and Revankar, V. K., “Spectroscopy, structure, and electrochemistry of transition metal complexes having [M2N2OS2] coordination sphere”, Journal of Coordination Chemistry, vol. 63, pp. 3301-3312, 2010.[Abstract]


Binuclear transition metal complexes of bicompartmental SNONS donors were synthesized and characterized by various physico-chemical techniques. Two different precursors with chloromethyl/formyl functionality at the 2 and 6 positions of phenolate ring are used to construct the ligands. The quinoxaline scaffolds provide SN donors incorporated at the 2 and 6 positions. Copper and zinc complexes are square pyramidal, whereas nickel and cobalt complexes are octahedral. The influence of two metal centers in terms of cooperative effect on the electronic, magnetic, electrochemical, and structural properties was investigated.

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2010

Journal Article

Dr. Naveen V. Kulkarni, Budagumpi, S., Kurdekar, G. Suresh, Revankar, V. Krishna, and Didagi, S., “Anticonvulsant Activity and Toxicity Evaluation of CuII and ZnII Metal Complexes Derived from Triazole-Quinoline Ligands”, Chemical and Pharmaceutical Bulletin, vol. 58, pp. 1569-1575, 2010.

2010

Journal Article

Dr. Naveen V. Kulkarni, Sathisha, M. P., Budagumpi, S., Kurdekar, G. S., and Revankar, V. K., “Binuclear transition metal complexes of bicompartmental SNO donor ligands: synthesis, characterization, and electrochemistry”, Journal of Coordination Chemistry, vol. 63, pp. 1451-1461, 2010.[Abstract]


A series of new binucleating CoII, NiII, CuII, and ZnII complexes of bicompartmental ligands with SNO donors was prepared. The Schiff bases were obtained by the condensation of 4,6-diacetylresorcinol and mercapto-substituted 1,2,4-triazoles. The ligands and their complexes were characterized by elemental analysis, infrared, 1H-NMR, UV-Vis, FAB-mass, and ESR spectral studies, magnetic susceptibility, and conductivity measurements. All the complexes were monomeric and binuclear. NiII and CoII complexes were octahedral, whereas CuII and ZnII complexes were square planar and tetrahedral, respectively. The compounds are investigated for electrochemical activity

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2010

Journal Article

M. P. Sathisha, Budagumpi, S., Dr. Naveen V. Kulkarni, Kurdekar, G. S., Revankar, V. K., and Pai, K. S. R., “Synthesis, structure, electrochemistry and spectral characterization of (d-glucopyranose)-4-phenylthiosemicarbazide metal complexes and their antitumor activity against Ehrlich Ascites Carcinoma in Swiss albino mice”, European Journal of Medicinal Chemistry, vol. 45, pp. 106 - 113, 2010.[Abstract]


The novel glycosyl saccharide derivative, (d-glucopyranose)-4-phenylthiosemicarbazide (LH) and its complexes, with cobalt(II), nickel(II), copper(II) and zinc(II) were synthesized, characterised and tested for cytotoxic effects. The copper complex, [CuLCl] inhibited Ehrlich Ascites Carcinoma (EAC) induced cancer cell lines in Swiss albino mice at LC50=1.94×10−8 (LC50=2.76×10−8 for cisplatin) and so distinctly better than free ligand and other complexes.

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2010

Journal Article

G. S. Kurdekar, Dr. Naveen V. Kulkarni, Budagumpi, S., Sathisha, M. P., Bevinhalli, N. H., and Revankar, V. K., “Construction of mononuclear transition metal(II) complexes with bi- and tridentate, neutral hydrazone ligands with a quinoxaline hub”, Journal of Coordination Chemistry, vol. 63, pp. 2172-2180, 2010.[Abstract]


A series of Co(II), Ni(II), Cu(II), and Zn(II) complexes of bi- and tridentate hydrazones were prepared. Ligands L1 and L2 were synthesized by the condensation of 2-mercapto-3-hydrazinoquinoxaline with 2-hydroxy-3-formylquinoline and 3-acetylcoumarin, respectively. The compounds were characterized by various spectro-analytical techniques and magnetic moment studies. The complexes are found to be monomeric and non-electrolytes. In these complexes, [CuL1Cl2] has square pyramidal geometry and others have octahedral. The copper complexes are electrochemically active in the applied potential range.

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2010

Journal Article

S. Budagumpi, Sathisha, M. P., Dr. Naveen V. Kulkarni, Kurdekar, G. S., and Revankar, V. K., “Transition metal complexes of pyrazole head 24-membered polyazamacrocyclic bimetal cores: synthesis, characterization, electrochemistry and spectral study”, Journal of Inclusion Phenomena and Macrocyclic Chemistry, vol. 66, pp. 327–333, 2010.[Abstract]


A series of new 24-membered macrocyclic CoII, NiII, CuII and ZnII complexes of the ligands L1H2 and L2H2 were prepared by the non-template and template methods respectively. The ligand L1H2 was formed by the condensation of pyrazole-3,5-dicarbohydrazide and glyoxal and all attempts to isolate the ligand L2H2 were unsuccessful. These, ligand and transition metal complexes were characterized on the basis of elemental analysis, IR, 1HNMR, UV–Visible, magnetic susceptibility measurements, ESR, conductivity measurements, FAB-mass and thermal analysis. The redox behavior of metal ions in the polyazamacrocyclic ligand field is also studied. Electroreduction of carbon dioxide to carbon monoxide is mainly focused on using polydentate azamacrocyclic ligands with amine and imine functionalities, based on the electrochemical behavior of nickel (II) ion in the macrocyclic territory.

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2010

Journal Article

S. Budagumpi, Kurdekar, G. S., Dr. Naveen V. Kulkarni, and Revankar, V. K., “Bi- and tetranuclear ligational deeds of a polyaza macrocycle having four diazine (N2) bridging components headed for CoII, NiII, CuII and ZnII ions: An emphasis on electrochemistry of non-innocent ligand system”, Journal of Inclusion Phenomena and Macrocyclic Chemistry, vol. 67, pp. 217–223, 2010.[Abstract]


Novel bi- and tetranuclear CoII, NiII, CuII and ZnII complexes having diazine bridging units have been prepared and characterised on the basis of analytical and spectroscopic techniques. With the help of electronic spectra and magnetic moment measurements, it is predicted that the CoII and NiII complexes have octahedral geometry while CuII and ZnII complexes found to be square pyramidal. Present ZnII and CuII complexes are binuclear in nature, where as CoII and NiII complexes are tetranuclear with feeble antiferromagnetic exchange interactions. UV–visible spectral studies, in the range 275–425 nm, evidence the significant blue shift in $π$ → $π$* transition which provide the ease of stabilization of bonding molecular orbitals in the complexes. All complexes are monomeric in nature. Ligand and all complexes were found to be electrochemically active compounds. One electron transfer process is observed in ligand similarly, there is no significant change in the cyclic voltammograms of CoII and ZnII complexes, while CuII and NiII complexes show one and two electron transfer redox behaviours, respectively in the present macrocyclic ligand field.

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2010

Journal Article

Dr. Naveen V. Kulkarni, Hegde, G. S., Kurdekar, G. S., Budagumpi, S., Sathisha, M. P., and Revankar, V. K., “Spectroscopy, Electrochemistry, and Structure of 3d-Transition Metal Complexes of Thiosemicarbazones with Quinoline Core: Evaluation of Antimicrobial Property”, Spectroscopy Letters, vol. 43, pp. 235-246, 2010.[Abstract]


<p> A series of Co(II), Ni(II), Cu(II), and Zn(II) complexes of quinoline-thiosemicarbazones was prepared. The Schiff base ligands that provide N, O, and S donor atoms for ligation are synthesized by the condensation of 2-hydroxy-3-formylquinoline with substituted thiosemicarbazides in ethanol. The ligands and complexes are characterized by elemental analysis, infrared, 1H NMR, UV-Vis, fast atom bombardment (FAB) mass spectroscopy, and electron spin resonance (ESR) spectral studies followed by magnetic susceptibility and conductivity measurements. The ligand-to-metal ratio is found to be 1:1 and 2:2 for the complexes of L1H2 and L2H2, respectively. All the complexes are found to have octahedral geometry except [CuL1H(H2O)Cl], which exhibits a square pyramidal structure. All the complexes are nonelectrolytic in nature and the electrochemical behavior of complexes is dealt with briefly. Further ligands and complexes were evaluated for their antimicrobial activity against bacteria Escherichia coli and Pseudomonas aeruginosa and fungi Aspergillus niger and Cladosporidium.</p>

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2009

Journal Article

S. Budagumpi, Shetti, U. N., Dr. Naveen V. Kulkarni, and Revankar, V. K., “Ligational behavior of a bidentate coumarin derivative towards CoII, NiII, and CuII: synthesis, characterization, electrochemistry, and antimicrobial studies”, Journal of Coordination Chemistry, vol. 62, pp. 3961-3968, 2009.[Abstract]


A series of new Co(II), Ni(II), and Cu(II) complexes of Schiff base derived from coumarin have been prepared and characterized by analytical and spectral methods. The Schiff base is synthesized by the condensation of 2,6-diaminopyridine and 3-acetylcoumarin in 1 : 1 stoichiometric ratio. All complexes have 1 : 1 metal : ligand ratio except the nickel complex, where it was found to be 1 : 2. UV-Vis spectra and magnetic moment studies confirm the existence of tetrahedral and octahedral geometries around cobalt(II) and nickel(II) metal ions, respectively, but copper(II) chloride/nitrate/sulfate complexes have square-planar geometry and copper(II) acetate complex is distorted octahedral. ESR spectra of copper complexes at room temperature and liquid nitrogen temperature were tetragonal. All the complexes were found to be more active against bacteria except Ni(II) complex; only CuLSO4 and CuL(CH3COO)2 have shown the enhanced activity against fungi.

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Publication Type: Book Chapter

Year of Conference Publication Type Title

2017

Book Chapter

W. D. Jones and Dr. Naveen V. Kulkarni, “Chemistry of Mn and Co Pincer Compounds”, in The Chemistry of Pincer Compounds, second edition, 2017.

Publication Type: Conference Proceedings

Year of Conference Publication Type Title

2017

Conference Proceedings

Dr. Naveen V. Kulkarni, Hayes, C., R. Baker, T., and Jones, W. D., “Catalytic upgrading of ethanol to 1- ​butanol via Guerbet reaction”, 254th ACS National Meeting & Exposition. Washington, DC, USA, 2017.

2017

Conference Proceedings

Dr. Naveen V. Kulkarni, Hayes, C., Jones, W., and Baker, R., “Cheaper By The Baker's Dozen: Towards Base-Metal Guerbet Catalysts For Selective Butanol Production”, 254th ACS National Meeting & Exposition. 2017.

2016

Conference Proceedings

Dr. Naveen V. Kulkarni, Hayes, C. E., Jones, W. D., and R. Baker, T., “Selective Formation of n-¬Butanol from Ethanol”, ACS-Rochester section, Chemistry in Emerging Technologies Lectures. 2016.

2016

Conference Proceedings

Dr. Naveen V. Kulkarni, “New Routes to C4 Alcohols”, The Center for Enabling New Technologies through Catalysis (CENTC) Annual Meeting (Talk). University of Washington, Seattle, WA, United States, 2016.

2016

Conference Proceedings

Dr. Naveen V. Kulkarni, “Selective Formation of n­Butanol from Ethanol”, The Center for Enabling New Technologies Through Catalysis (CENTC) Annual Meeting (Poster). University of Washington, Seattle, WA, United States, 2016.

2016

Conference Proceedings

Dr. Naveen V. Kulkarni, “Zinc mediated carbene insertion into C-H and C-Cl bonds”, First Annual Symposium of center for energy and environment (Poster). University of Rochester, Rochester, NY, United States, 2016.

2014

Conference Proceedings

Dr. Naveen V. Kulkarni, Elkin, T., Tumaniskii, B., Botoshansky, M., Shimon, L. J. W., and Eisen, M. S., “Group 4 Complexes: Synthesis, Structure and Their Reactivity in the Polymerization of α-Olefins.”, ACS Regional Meeting , vol. 33. University of Texas Arlington, TX, United States, pp. 3119-3136, 2014.[Abstract]


A series of asymmetric formamidine ligands bearing different substituents with various steric and electronic properties on the nitrogen of the N–C–N motif were synthesized. Group 4 bis(formamidinate) dimethylamido, chloride, and benzyl complexes were studied using these asymmetric ligands and their solid-state structures and their behavior in solution were determined. These complexes were activated with MAO (methylalumoxane) or a combination of cocatalysts and tested in the polymerization of ethylene and propylene. A noticeable influence of the formamidine nitrogen substituents on the activity of the catalyst and properties of the obtained polymers was observed. Further, a plausible mechanism for the polymerization of propylene is presented derived from a combination of ESR-C60 and MALDI-TOF trapping experiments which shed light on the nature of the active catalytic species.

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2012

Conference Proceedings

Dr. Naveen V. Kulkarni, Elkin, T., Botoshansky, M., Shimon, L. J. W., and Eisen, M. S., “Group IV complexes of asymmetric formamidine ligands and polymerization of olefins”, Chemistry Graduate Student Open Seminar. Technion (Poster). 2012.

2008

Conference Proceedings

Dr. Naveen V. Kulkarni, Budagumpi, S., Kurdekar, G. S., and Revankar, V. K., “Synthesis and Structure of novel CoII, NiII, CuII and ZnII complexes derived from 1H-pyrazole-3, 5-bis-thiosemicabazide: antimicrobial screening and DNA binding/cleavage study”, International Conference on Frontiers in Chemical research (ICFCR-2008)’ (Poster). University, Mangalore, 2008.

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