Supramolecular architecture of cadmium(II)-terephthalate complexes having a tridentate or tetradentate Schiff base as blocking coligand

Two new cadmium(H)-terephthalate complexes, (infinity) (1){[Cd-2 (mu-terephthalate)(2)(L-1)(2)] (.) 9H(2)O} (1) and [{Cd(H2O)(L-2)}(2)(mu-terephthalate)](mu-terephthalate) (.) 10H(2)O (2), where L-1 = (E)-N-1,N-1-diethyl-N-2-(1-(pyridin-2-yl)ethylidene)ethane-1,2-diamine; L-2 = N,N'-bis-(1-pyridin-2-yl-ethylidene)-ethane-1,2-diamine; terephthalate = benzene-1, 4-dicarboxylate -O2C-C6H4-CO2- have been synthesized by a conventional Solution method. Characterization by single crystal X-ray crystallography shows that compound I is composed of I-D polymeric zig-zag chains with distorted pentagonal-bipyramidal cadmium centers. Compound 2 consists of centrosymmetric dinuclear complexes with a distorted pentagonal-bipyramidal cadmium center in which one terephthalate ligand bridges the metal centres and another terephthalate anion with water of crystallization forms a H-bonding network. (c) 2005 Elsevier Ltd. All rights reserved.