Synthesis and characterization of two- and three-dimensional coordination polymers built with 3,5-bis(4′-carboxy-phenyl)-1,2,4-triazole and/or 1,4-bis(imidazol-1-ylmethyl)benzene

Abstract

Two new coordination polymers, [Cd(bct)(H₂O)]·(H₂O) (1) and [Zn(bct)(bip)]·2(H₂O) (2) (H₂bct = 3,5-bis(4′-carboxy-phenyl)-1,2,4-triazole, bip = 1,4-bis(imidazol-1-ylmethyl)benzene), have been synthesized. Their structures have been determined by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, IR spectroscopy, and thermogravimetric analysis. Compound 1 is a two-dimensional structure with double-layered network, where bct ligands adopt a μ ₄ -k ¹,k ¹,k ¹,k ¹ bridging mode linking four five-coordinate Cd ions. Compound 2 exhibits a three-dimensional framework consisting of double-layered helical chains with the bct and bip adopting μ ₃ -k ¹,k ¹,k ¹ and μ ₂ -k ¹,k ¹ bridging mode, respectively. Complexes 1 and 2 exhibit intense emissions at 399 and 441 nm, respectively.

Keywords:

• Cadmium
• Zinc
• Coordination polymer
• Crystal structure
• Fluorescence

Acknowledgement

This project is supported by the Natural Scientific Research Foundation of Shaanxi Provincial Education Office of China (No. 11JK0583), and science and technology research and development projects of Shaanxi Provincial (No. 2013JM2015).