Five metal imidazole dicarboxylate-based compounds comprising M3(MIDC)2 entities (M = Zn2+, Co2+, Mn2+): syntheses,structures and properties |
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| Abstract: | 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]n layers. We also investigated the effects of different neutral terminal or bridging ligands on M3(MIDC)2]n layers. Coplanar M3(MIDC)2]n layers and 4,4-bipy were used to construct 3-D frameworks of 1 and 2. Puckered M3(MIDC)2]n layers were found in 3–5; 4 is the first M3(L)2]n layer structure with two crests and troughs during each period (L = imidazole-4,5-dicarboxylic acid or its analog). Compound 5 is the first puckered M3(L)2]n layer structure decorated by chelating neutral ligands. Compound 1 exhibits weak blue photoluminescence in the solid state at room temperature. Variable-temperature magnetic susceptibility measurements of 2–5 indicate strong antiferromagnetic interactions. |
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| Keywords: | Coordination polymer Crystal structure Imidazole dicarboxylate |
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