A 3D Cd(II) coordination polymer with (41263) topology: Synthesis, crystal structure and photoluminescent properties

A new coordination polymer [Cd2(cpta)(H2O)4]n (1) (H4cpta = cis,cis,cis-1,2,3,4-cyclopentanetetracarboxylic acid) has been hydrothermally synthesized and structurally characterized by IR, elemental analysis and single-crystal X-ray diffraction. Single-crystal X-ray diffraction reveals that 1 is a six-connected pcu-type network with (41263) topology. 1 also displays strong fluorescent emissions in the solid state at room temperature.

A new 3D 6-connected coordination polymer with 41263 topology, [Cd2(cpta)(H2O)4]n (H4cpta = cis,cis,cis-1,2,3,4-cyclopentanetetra carboxylic acid), has been synthesized under hydrothermal synthesized using H4cpta as linear linkers and Cd4-clusters as 6-connected nodes.Figure optionsDownload as PowerPoint slideResearch Highlights
► Recently, a large number of organic ligands as potential linkers, polynuclear coordination polymers consisting polycarboxylate ligands have witnessed the most important development.
► To the best of our knowledge, complexes based on cis,cis,cis-1,2,3,4-cyclopentanetetracarboxylic ligand have rarely been reported, maybe due to its versatility and flexibility in binding fashions when forming coordination architectures, although the rigid tetracarboxylate ligand, benzene-1,2,4,5-tetracarboxylic acid, has been widely investigated.
► In this study, we select cis,cis,cis-1,2,3,4-cyclopentanetetracarboxylic acid considering its following several feature: (a) it has four carboxyl groups that provide versatile binding fashions; (b) In view of the number of deprotonated carboxyl groups, it can behave not only as hydrogen-bond acceptor but as hydrogen-bond donor; (c) It connects the metal ions in various directions, because all carboxyl groups do not lie in one plane. In this paper, we report the synthesis, crystal structure, and photoluminescence of a new [Cd2(cpta)(H2O)4]n(1), which features an interesting 3D coordination polymer.