Three main group metal coordination polymers bearing imidazole-based dicarboxylates: Hydro(solvo)thermal syntheses, crystal structures and properties

Three coordination polymers [Pb(HMIDC)](n) (1), [Ba(H2MIDC)(2)](n) (2) and {[Mg(HMIDC)(H2O)2]center dot H2O}(2) (3) (H3MIDC = 2-methyl-1H-imidazole-4,5-dicarboxylic acid) have been yielded under different hydro(solvo)thermal conditions. X-ray diffraction analysis reveals that compound 1 exhibits a 3-0 framework constructed by 2-D networks joined by 1,mu(4)-HMIDC2- bridges. Compound 2 also presents a 3-D structure, which is generated from 2-0 layers pillared by 1-D chains along the c-axis. Compound 3 is a 1-D infinite chain and forms supramolecular layers through hydrogen bonds. The thermal and solid-state photoluminescence properties of polymers 1-3 have been determined as well. The theoretical predication of the methyl substituent effect of the ligand H3MIDC has been investigated. (C) 2010 Elsevier Ltd. All rights reserved.