One newly prepared 3D polymer (1) composed of left- and right-handed helices containing [Cd8(p-ClPhHIDC)12(4,4′-bipy)6] cages shows selective pyridine recognition, with a visual colour change from pearl to pink under ultraviolet irradiation.

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N N H HOOC COOH Cl N N H HOOC COOH Cl Three different structural lead(II) polymers constructed from newly designed 2-chlorophenylimidazole dicarboxylate ligands. A 1-D coordination polymer, {[Pb(o-ClPhH 2 IDC) 2 ]·H 2 O} n (o-ClPhH 3 IDC = 2-(2-chlorophenyl)-1H-imidazole-4,5-dicarboxylic acid) (1), a 2-D coordination polymer, [Pb 3 (p-ClPhIDC) 2 (H 2 O)] n (p-ClPhH 3 IDC = 2-(4-chlorophenyl)-1H-imidazole-4,5-dicarboxylic acid) (2), and a 3-D polymer, [Pb(p-ClPhH 2 IDC) 2 ] n (3), have been obtained solvothermally and structurally characterized by elemental analyses, IR, and single-crystal X-ray diffraction. Although they were prepared with similar ligands and Pb 2+ , polymers 1-3 show distinct structures. The X-ray powder diffraction and thermal properties of the polymers have been investigated. The influence of the reaction conditions to the final products and coordination of the organic ligands are discussed.