The Construction of a 3D Pr(III) Coordination Polymer Based on 2-Methyl Imidazole-4,5-dicarboxylate and Oxalate Ligands

Abstract

Solvothermal reaction of Pr(NO₃)₃ ^.6H₂O with 2-methyl-1H-imidazole-4,5-dicarboxylic acid (H₃MIDC) and ammonium oxalate affords a metal-organic framework, {[Pr₂(μ₃-HMIDC)₂(μ₂ -C₂O₄)(H₂O)₃]·EtOH·3H₂O}_n (1), which has been structurally characterized by single-crystal X-ray diffraction. Polymer 1 exhibits a novel 3D structure, in which infinite 1D chains, composed of nine-coordinated Pr(III) ions and oxalates, were linked by μ₃-HMIDC^2– to give rise to a 3D architecture. Its thermal and solid-state fluorescence properties have been investigated.

Keywords:

• crystal structure
• imidazole dicarboxylate
• polymer Pr(III)
• properties

Acknowledgments

The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (21071127, 20501017, and J0830412), and by the Natural Science Foundation of Henan Educational Committee (2009A150028 and 2011A150029).