A Series of Single, Double, and Triple Me<sub>2</sub>biim-Bridged Dinuclear, Trinuclear, and Polymeric Complexes: Syntheses, Crystal Structures, and Luminescent Properties
收藏资源简介：
Reaction of ZnCl2 and Me2biim (Me2biim = N,N‘-dimethyl-2,2-‘-biimidazole) in acidic or neutral aqueous solutions gave the noncoordinated ZnCl4·H2Me2biim (1) or the double Me2biim bridged [Zn2Cl4(μ-Me2biim)2] (2). Use of CdX2 (X = Cl, Br, I) instead of ZnCl2 yielded the single Me2biim bridged one-dimensional coordination polymer [CdX2(μ-Me2biim)]n (X = Cl, 3; Br, 4; I, 5). The stacking of the infinite chains are dominated by C−H···X interactions in 3 and 4 but by I···I interactions in 5, responsible for their different crystal structures. Use of Zn(NO3)2 instead of ZnCl2 produced the novel triple Me2biim-bridged [Zn2(μ-Me2biim)3(H2O)2](NO3)4·H2O (6). The unprecedented hexa-Me2bim bridged trinuclear [Cd3(μ-Me2biim)8]2(ClO4)12(H2O)6 (7) was obtained by using Cd(CH3CO2)2 in the presence of NaClO4. Compounds 1−7 were characterized by X-ray crystallography and IR. Examination of photophysical properties of 1−7 indicates that the fluorescence emission of Me2biim has been effectively enhanced, quenched, or shifted in its metal complexes 1−7.
