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.
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.