Synthesis, Structural Characterization and Properties of Copper( II ) and Zinc( II ) Coordination Polymers with a New Bridging Chelating Ligand

Two new coordination polymers [Cu 3 (cpida) 2 (H 2 O) 4 ] n ·4 n H 2 O ( 1 ) and [Zn(Hcpida)] n · n H 2 O ( 2 ) have been synthesized with a new bridging chelating ligand N ‐(4‐carboxyphenyl)iminodiacetic acid (H 3 cpida). X‐ray diffraction analysis reveals that complex 1 consists of 1D parallelogram‐shaped molecular‐box chains constructed from unusual linear trinuclear Cu II secondary building units (SBUs), which further extend into 2D layers by perfect parallel AA stacking. Complex 2 adopts a 2D framework comprised of tetrahedral Zn II centres isolated from each other by the bridging bidentate carboxylate groups of the Hcpida 2− ligands. Compound 2 possesses alternate open and closed channels along the a direction. The dehydation and rehydration experiments showed that compound 2 undergoes a reversible inclusion process to some extent. However, the removal of guest water molecules from 1 results in the collapse of the polymeric networks owing to the loss of the coordinated water molecules. Compound 2 also shows strong photoluminescence and may be a good candidate for a photoactive or porous material. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)