Five metal imidazole dicarboxylate-based compounds comprising M 3 (MIDC) 2 entities (M = Zn , Co , Mn ): syntheses, structures and properties.

Five metal imidazole dicarboxylate-based compounds, {[Zn3(MIDC)2(4,4′-bipy)3](4,4′-bipy)·8H2O}n(1), {[Co3(MIDC)2(4,4′-bipy)3](4,4′-bipy)·6H2O}n(2), {[Co3(MIDC)2(py)2(H2O)2]}n(3), {[Mn6(MIDC)4(py)5(H2O)4]}n(4), and {[Mn3(MIDC)2(Phen)3(H2O)2]}n(5) (H3MIDC = 2-methyl-1H-imidazole-4,5-dicarboxylic acid; 4,4′-bipy = 4,4′-bipyridine; py = pyridine; Phen = 1,10-phenanthroline), have been synthesized under hydrothermal conditions and characterized by elemental analyses, IR spectroscopy, thermogravimetric analysis, and single-crystal X-ray diffraction. We control the coordination modes of H3MIDC via hydrazine and obtained a series of coordination compounds containing honeycomb-like [M3(MIDC)2]nlayers. We also investigated the effects of different neutral terminal or bridging ligands on [M3(MIDC)2]nlayers. Coplanar [M3(MIDC)2]nlayers and 4,4-bipy were used to construct 3-D frameworks of1and2. Puckered [M3(MIDC)2]nlayers were found in3–5;4is the first [M3(L)2]nlayer structure with two crests and troughs during each period (L = imidazole-4,5-dicarboxylic acid or its analog). Compound5is the first puckered [M3(L)2]nlayer structure decorated by chelating neutral ligands. Compound1exhibits weak blue photoluminescence in the solid state at room temperature. Variable-temperature magnetic susceptibility measurements of2–5indicate strong antiferromagnetic interactions. Using a method, which can effectively control the coordination mode of H3MIDC, we constructed a series of new coordination compounds containing honeycomb-like [M3(MIDC)2]nlayers. [ABSTRACT FROM AUTHOR]