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Two novel metalϪorganic coordination polymers, [Cd(bqdc)(phen) 2 ] n (1), [Cd(bqdc)(phen)] n (2), (H 2 bqdc ϭ 2,2Ј-biquinoline-4,4Ј-dicarboxylic acid, phen ϭ 1,10-phenanthroline) were obtained with different metal/ligand ratios through hydrothermal method. Their structures were determined by single-crystal X-ray diffraction. In two complexes, central Cd 2ϩ ions and (bqdc) 2Ϫ ligands display completely different coordination modes. 1 is a 1-D zigzag chain, two phen ligands chelate to one cadmium atom, 2053 which is rare in similar polymers. 2 is a 3-D framework, exhibits an unusual eight-coordinate structure (CdN 2 O 6 ) and the coordination polyhedron can be described as distorted monocapped pentagonal bipyramid. 1 and 2 are stable in air, and show blue photoluminescence at room temperature.

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