Syntheses, crystal structures, and luminescence of two new coordination polymers based on biphenyl-2,2′,4,4′-tetracarboxylate

Abstract

Two new coordination polymers, [Zn(H₂btc)(4,4′-bpy)₂] _n (1) and {[Cd(H₂btc) (terpy)] · H₂O} _n (2) (H₄btc = biphenyl-2,2′,4,4′-tetracarboxylic acid, 4,4′-bpy = 4,4′-bipyridine, terpy = terpyridine), have been synthesized under hydrothermal conditions and characterized by elemental analysis, IR spectra, and single-crystal X-ray diffraction. Complexes 1 and 2 are 1-D chains linked through partially deprotonated H₄btc. The adjacent 1-D chains of 1 are further formed into 2-D supramolecular architecture through inter-chain N–H···O hydrogen bonds. In contrast, due to a different auxiliary ligand, the 1-D chains of 2 are further extended into 3-D supramolecular framework through inter-chain O–H···O hydrogen bonds. Thermal stabilities and luminescence of 1 and 2 were also studied.

Keywords:

• Biphenyl-2,2′,4,4′-tetracarboxylate
• Synthesis
• Crystal structure
• Luminescence

Acknowledgments

This project was supported by the Natural Scientific Research Foundation of Shaanxi Provincial Education Office of China (Nos. 2010JK918, 2010JK903, 2010JK905, 2010JS061, and 2010JS062) and the Natural Scientific Research Foundation of Yan' an City Technology Division of China (Nos. 2009kg-01 and 2009ks-24).