Syntheses, Structures, And Property Studies Of Coordination Compounds Based On Bis(Imidazole) And Dicarboxylate Ligands

In recent years, the research of mental-organic coordination compounds with intriguingvariety of architectural features and potential applications in magestism, gas adsorption,catalysis, chiral recognition and separation, luminescence and nonlinear optical, biology, andso on, has becoming a focus of the coordination chemistry and crystal engineering. In thispaper, we have been hydrothermally synthesized ten complexes by using bisimidazole ligands（2,2′-biimidazole,1,1′-（1,4-butyl）biimidazole） mached with different dicarboxylic ligands tocoordinate with ZnII, CdIIand CoII. We characterized these complexes by IR, elementalanalyses and X-ray single crystal diffraction, and we also studied the thermal stabilities andfluorescence properties of them.1. We have prepared seven new complexes by using2,2′-biimidazole mached withdifferent dicarboxylic ligands to coordinate with ZnII, CdIIunder the hydrothermal condition.[CdH₂biim（Himdc）]_n（1）[ZnH₂biim（2,3-pzdc）]_n（2）[CdH₂biim（2,3-pzdc）]_n（3）[ZnH₂biim（HO-BDC）（H₂O）₃]_n（4）[CdH₂biim（HO-BDC）（H₂O）₃]_n（5）[Cd（ip-OH）（H₂biim）（H₂O）][Cd（ip-OH）（H₂biim）（H₂O）₃]·8（H₂O）（6）[CdH₂biim（HO-BDC）]_n（7）Complex1shows1D zigzag chain structuer. Complexes2and3are isostructuraldisplaying2D layer structures. Isostructural complexes4and5crystallize in P1chiral spaceshowing0D structure. In complex6, co-existing0D and1D motifs are connected bysupramolecular forces to form3D structure. Complex7is3D structure. Meanwhile, westudied the thermal stabilities of complexes1-6and the fluorescence properties of complexes1-7.2. Three complexes have been hydrothermally synthesized by using1,1′-（1,4-butyl）biimidazole as well as5-hydroxylisophthalic acid coordinated with ZnII, CoIItransition metal ions, respectively.[Co（HO-BDC）（bbi）]_n（8）[Co（HO-BDC）（bbi）]2·H₂O （9）[Zn（HO-BDC）（bbi）]_n（10）Complex8is2D layer structure. Complex9manifests a deeply corrugated2D layerbased on （4,4） motifs. Complex10demonstrates2Dâ†'3D parallel interpenetration of highlyundulating networks based on （4,4） motifs. The thermal stabilities and fluorescence properties of8-10have been investigated.