2-Phenyl-4,5-imidazole dicarboxylate-based metal–organic frameworks assembled under hydro(solvo)thermal conditions

Abstract

Four metal–organic frameworks, namely, [Cd₂(μ₂-HPhIDC)₂(phen)₂] (H₃PhIDC = 2-phenyl-1H-imidazole-4,5-dicarboxylic acid, phen = 1,10-phenanthroline) (1), [Cd₂(μ₂-HPhIDC)₂(2,2′-bipy)₂] (2,2′-bipy = 2,2′-bipyridine) (2), [Pb₃(μ₄-PhIDC)₂(H₂O)] (3) and [Sr(μ₂-H₂PhIDC)₂(H₂O)₄]·2H₂O (4) have been synthesized under hydro(solvo)thermal conditions, and characterized by elemental analysis, IR spectroscopy and single crystal X-ray diffraction. Both 1 and 2 are one-dimensional (1-D) infinite chains. Compound 3 features a two-dimensional (2-D) framework, in which Pb²⁺ ions are bridged by μ₄-PhIDC³⁻ ligands. Compound 4 possesses a three-dimensional (3-D) framework with a uninodal 4-connected net. The thermal and photoluminescence properties of polymers 1–4 have been investigated as well.