Publication Type:

Journal Article

Source:

Crystal Growth & Design, Volume 11, Number 5, p.1512-1519 (2011)

URL:

http://dx.doi.org/10.1021/cg1014169

Abstract:

The pyridyloxycarbophosphazene, [NC(NMe2)]2[NP(p-OC5H4N)2] (L), reacted with Cd(OAc)2·4H2O to afford a rail-road-like double-strand coordination polymer, [{Cd(CH3COO)2(L)}(CH3OH)(H2O)2]n (1). The crystal structure of 1 reveals that L functions as a bridging ligand to link successive cadmium atoms. Two such parallel-running strands are further interconnected by actetate bridging ligands forming Cd2O2 four-membered connections. The double-stranded coordination polymer is taken into the second dimension by intermolecular hydrogen bonding between the oxygen atoms of the acetate bridge and a tetrameric water cluster. Interaction of L with Cd(NO3)2·4H2O leads to the formation of [Cd(NO3)2(L)(MeOH)]n (2). In the presence of pyridine (Py), this reaction affords [Cd(NO3)2(L)(Py)2]n (3). In contrast to 1, compounds 2 and 3 are single-strand one-dimensional (1-D) coordination polymers. In 1−3, the cadmium atoms are seven-coordinate in a pentagonal−bipyramidal geometry. The reaction of L with ZnCl2, MnCl2, or CoCl2 leads to the formation of [{Zn(Cl)2(L)}(MeOH)]n (4), [Mn(Cl)2(L)2]n (5), and [Co(Cl)2(L)2]n (6). Structure 4 is a simple 1-D coordination polymer containing tetrahedral zinc atoms, while 5 and 6 are macrocycle-linked coordination polymers. In the latter, successive metal atoms are linked by a pair of carbophosphazene ligands to generate 24-membered macrocyclic rings which are interconnected to each other at the metal center to afford the coordination polymer chain.

Cite this Research Publication

V. Chandrasekhar, Senapati, T., Dey, A., Hossain, S., and Dr. Gopal K., “Carbophosphazene-Based Multisite Coordination Ligands: Metalation Studies on the Pyridyloxy Carbophosphazene, [NC(NMe2)]2[NP(p-OC5H4N)2]”, Crystal Growth & Design, vol. 11, pp. 1512-1519, 2011.

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