Synthesis and structures of two cobalt(II)coordination networks formed from aromatic polycarboxylates and 1,4-bis(imidazole-1-ylmethyl)benzene

摘要

Two Co(II)coordination polymers,[Co(Hbtc)-(bix)]_n,(1)and [Co(1,4-bdc)(bix)H2O]_n(2)(bix = 1,4-bis(imidazole-1-ylmethyl)benzene;H3btc = benzene-1,3,5-tricarboxylic acid;1,4-H2bdc = benzene-1,4-dicarboxylic acid)have been synthesized under hydrothermal conditions and structurally characterized.X-ray structure analysis reveals that in polymer 1,2D infinite grid-like frameworks are interconnected by hydrogen-bond interactions to result in a 3D supramolecular architecture,in which the three car-boxylate groups of the H3btc molecule adopt three different coordination modes.In polymer 2,1,4-bdc ligands with cobalt atoms construct 1D zigzag chains which are bridged by bix ligands to form a 3D framework.