Synthesis, structure, and thermal properties of 3-D coordination polymers constructed from asymmetrical carboxylates

Abstract

Three new coordination polymers constructed from asymmetric ligands were synthesized under hydrothermal conditions and characterized with single crystal X-ray analysis, infrared, and thermal gravimetric methods. Complex 1 exhibits a 3-D network constructed from rod-shaped secondary building units. Pyrimidine-4-carboxylic acid (bpa) was used as the starting material, but under hydrothermal conditions bpa formed 2,2′-pyrimidine-4,4′-dicarboxylic acid (bpda) in situ, which further connected with Pb. 3-D two-fold interpenetration of complex 2 was obtained by the similar method as described for 1, except that Cd(NO₃)₂ · 6H₂O was used instead of Pb(NO₃)₂ · 6H₂O to react with bpa. Complex 3 shows a three-connected 3-D network. Furthermore, the photoluminescence properties of 1 and 2 were studied.

Keywords:

• Coordination polymer
• Asymmetrical carboxylates
• 3-D network
• Photoluminescence property

Acknowledgments

We gratefully acknowledge financial support from the Fundamental Research Funds for the Central Universities (N09035002), Open Project of State Key Laboratory for Supramolecular Structure and Materials, China (SKLSSM 201002), and the Postdoctoral station Foundation of Northeast Normal University.