机构地区: 孝感学院化学与材料科学学院
出 处: 《化学学报》 2009年第14期1579-1584,共6页
摘 要: 采用溶剂扩散法制备了锰(Ⅲ)的两个单核配合物[Mn(Miao)2(H2O)2]ClO4(1)和[Mn(Miao)2(DMF)2]ClO4(2)(HMiao=1-甲基-2-咪唑醛肟,DMF=N,N-二甲基甲酰胺)的晶体.X射线衍射单晶结构表明:两种配合物均属三斜晶系,空间群Pī,锰与配体形成变形的八面体结构.采用Gaussian 03W程序计算了HMiao配体的电荷密度,理论计算与实际配位形式完全吻合.测定了两种锰配合物在DMF溶液中的电化学性质,循环伏安法表明两配合物均存在较好的氧化还原性,其氧化还原峰分别为0.75和0.70V,-0.32和-0.50V,是Mn(Ⅲ)和Mn(Ⅱ)之间的相互转化. The crystals of two manganese complexes [Mn(Miao)2(H2O)2]ClO4 (1) and [Mn(Miao)2- (DMF)2]ClO4 (2) [HMiao = 1-methylimidazole-2-aldoximate, DMF =N,N-dimethylformamide] were obtained by solvent diffusion. X-ray crystallographic analyses show that the compounds crystallize in the triclinic system, space group Pi. Each Mn(Ⅲ) and the coordination atoms form a slightly distorted octahedral geometry. The full-optimized molecular geometry of the HMiao ligand was calculated with Gaussian 03W program. The experimental coordinated forms of the Mn(Ⅲ) in the crystals are similar to the theoretical analysis. The electrochemical properties were studied in DMF. Cyclic voltammetry exhibits redox waves at 0.75 and 0.70 V, -0.32 and -0.50 V (versus SCE) in DMF corresponding to the [Mn^Ⅲ]/[Mn^Ⅱ] counles.