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.