Spectroscopic and electrochemical study of dinuclear and mononuclear copper complexes with the bidentate ligand of the 2,2′-diquinoline series
作者:S. Z. Vatsadze、A. V. Dolganov、A. V. Yakimanskii、M. Ya. Goikhman、I. V. Podeshvo、K. A. Lyssenko、A. L. Maksimov、T. V. Magdesieva
DOI:10.1007/s11172-010-0153-9
日期:2010.4
The newly synthesized complex (2) of copper(I) chloride with di-n-hexyl 2,2′-biquinoline-4,4′-dicarboxylate (L) was spectroscopically and electrochemically characterized. The X-ray diffraction study showed that the crystals of complex 2 consist of the dinuclear moieties [L2Cu1 2(μ-Cl)2] containing Cu2(μ-Cl)2 clusters. Spectrophotometric studies and ESI-mass spec-trometric measurements showed that after the dissolution of complex 2 in acetonitrile (AN) and N-methyl-2-pyrrolidone (NMP), the solution contained not only the dinuclear complexes [L2Cu1 2(μ-Cl)2] but also [L2Cu1]Cl, [LCu1Cl(Sol)], and [Cu1Cl(Sol)] (Sol is the solvent). The electrochemical data also confirm the conclusion that bridged dinuclear chloride complex 2 dissociates both in NMP and AN to form the tetrahedral bis-biquinoline complex [L2Cu1]Cl. In solutions of complex 2 in alcohols and N,N-dimethylformamide (DMF), only [L2Cu1]Cl and [Cu1Cl(Sol)] are present. In EtOH, AN, and DMF, [Cu1Cl(Sol)] undergoes disproportionation to [Cu11Cl(Sol)] and Cu0.
对新合成的氯化铜(I)与 2,2′-联喹啉-4,4′-二甲酸二正己酯(L)的络合物(2)进行了光谱和电化学表征。X 射线衍射研究表明,复合物 2 的晶体由含有 Cu2(μ-Cl)2 簇的双核分子 [L2Cu1 2(μ-Cl)2]组成。分光光度法研究和 ESI-质谱-色谱法测量结果表明,将配合物 2 溶解在乙腈(AN)和 N-甲基-2-吡咯烷酮(NMP)中后,溶液中不仅含有双核配合物 [L2Cu1 2(μ-Cl)2],还含有 [L2Cu1]Cl、[LCu1Cl(Sol)] 和 [Cu1Cl(Sol)](Sol 为溶剂)。电化学数据还证实了这样的结论:桥接双核氯化物复合物 2 在 NMP 和 AN 中都会解离,形成四面体双双喹啉复合物 [L2Cu1]Cl。在复合物 2 在醇和 N,N-二甲基甲酰胺(DMF)中的溶液中,只存在 [L2Cu1]Cl 和 [Cu1Cl(Sol)]。在 EtOH、AN 和 DMF 中,[Cu1Cl(溶胶)] 会发生歧化反应生成 [Cu11Cl(Sol)] 和 Cu0。