Two 3-D metal-organic frameworks constructed by 2-methyl or 2-ethyl imidazole dicarboxylates

Abstract

Two polymeric frameworks, [Zn₅(MIDC)₂(HMIDC)₂(phen)₅] _n (1) (H₃MIDC = 2-methyl-1H-imidazole-4,5-dicarboxylic acid, phen = 1,10-phenanthroline) and {[Ca₂(HEIDC)₂(H₂O)] · H₂O} _n (2) (H₃EIDC = 2-ethyl-1H-imidazole-4,5-dicarboxylic acid), have been solvothermally synthesized and structurally characterized by single-crystal X-ray diffraction. Compound 1 exhibits a 3-D structure constructed from 2-D layer motifs joined by µ ₂-HMIDC²⁻ or µ ₃-MIDC³⁻ ligands. Compound 2 also presents a 3-D framework, generated from 1-D chains linked by HEIDC²⁻ ligands by two different µ₅-modes. The thermal and solid-state photoluminescence properties of both the complexes have been determined.

Keywords:

• Coordination polymer
• Imidazole dicarboxylate
• Crystal structure
• Properties

Acknowledgments

We gratefully acknowledge the financial support by the National Natural Science Foundation of China (21071127, 20501017 and J0830412), and Program for New Century Excellent Talents in University and the Natural Science Foundation of Henan Education Department (2009A150028 and 2011A150029).