Two Cu(II) coordination polymers with single- and double-zigzag chains constructed from 4,4′-(dihydroxymethylene)dibenzoic acid

Two intriguing one-dimensional coordination polymers, [Cu-2(dhmdb)(2)(H2O)(2)]center dot 6H(2)O (1) and Cu(dhmdb)(1,10-phen) (2), have been hydrothermally synthesized and structurally characterized through exploring a new semi-rigid V-type dicarboxylate ligand with hydroxyl groups, 4,4 '-(dihydroxymethylene)dibenzoic acid (H(2)dhmdb). Complexes 1 and 2 display double- and single-zigzag chain structures, respectively, which further result in two-dimensional supramolecular networks by O-H center dot center dot center dot O hydrogen-bonds and pi center dot center dot center dot pi stacking interactions. The network of 1 possesses one-dimensional rhombic channels along c axis with the size of about 8 x 8 angstrom. The phase purity and thermal stability of 1 and 2 have also been investigated. (C) 2013 Elsevier B.V. All rights reserved.