Coordination polymers constructed from d10 ions, saturated or unsaturated aliphatic carboxylic acids, and bidentate nitrogen ligands: synthesis, characterization, and fluorescence

Five new coordination polymers synthesized from d10 metal ions, aliphatic carboxylic acids, and bidentate nitrogen ligands have been characterized with single crystallographic X-ray analysis, IR, and TG. Compound 1 has a twofold 3-D network. During the synthesis of 1, fumaric acid reacts with water giving malic acid, which coordinates Cd forming 2. If we use Zn instead of Cd, 1-D chain-like 3 is formed. With hydrogen bonds and - interactions, the 1-D covalent chains form a 3-D supramolecular network. The 3-D supramolecular networks connect together and form a twofold interpenetration structure. Compound 4 shows a 2-D layer structure. Compound 5 exhibits 1-D double-chain structure composed by hydrogen bonds. We studied the fluorescence of 1, 2, 3, and 5.