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Synthesis and crystal structures of two three-dimensional vanadium polyoxoanion-bridged macrocyclic metal complexes

Research paper by Guang-Chuan Ou, Xian-You Yuan, Zhi-Zhang Li

Indexed on: 19 Aug '12Published on: 19 Aug '12Published in: Transition Metal Chemistry



Abstract

The reactions of transition metal macrocyclic complexes [ML](ClO4)2 (L = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane, M = Ni, Cu) with NH4VO3 under hydrothermal conditions gave two coordination polymers, namely [NiL]2[V6O17] and [CuL]2[V6O17]. Single-crystal X-ray diffraction analyses indicated that the central Ni(II)/Cu(II) atom displays a distorted six-coordinate octahedral coordination geometry by coordination with four nitrogen atoms of L, and two oxygen atoms of [VO4] tetrahedrons. Compounds [NiL]2[V6O17] and [CuL]2[V6O17] show three-dimensional structures, which are constructed through the connections of dodecanuclear [V12O32]4− rings with [NiL]2+ in [NiL]2[V6O17], and [V8O22]n4n− chains with [CuL]2+ in [CuL]2[V6O17], respectively, generating one-dimensional channels.