Abstract
The complexes: [Cu(N3)2(N,N-diEten)]2, [Cu(N3)2(tmeen)]2, [Cu(N3)(NCO)(N,N-diEten)]2, [Cu(N3)2(N,N’-diMeen)]2 and [Cu(N3)(NCO)(tmeen)]2 were prepared, characterized and their electrochemical behavior was investigated by cyclic voltammetry and controlled potential electrolysis. Cyclic voltammograms for all complexes studied are similar and exhibit one pair of current peaks in the range of -0.65 to +0.0 V. The number of electrons obtained from controlled potential electrolysis at ca. -0.55 V for all compounds was 1.8 £ n £ 2.1, indicating that both copper(II) metallic centres in the molecule were reduced to copper (I). Comparing the peak potential values for these complexes one can observe that the redox process corresponding to copper(II)/copper(I) couple is slightly influenced by the s-basicity of the ligands.
Highlights
The copper (II) complexes containing pseudohalide ligands have gained much importance in recent years considering that their redox properties can contribute to better understanding of the structure and function of copper proteins[1,2,3]
Comparing the peak potential values for these complexes one can observe that the redox process corresponding to copper(II)/copper(I) couple is slightly influenced by the σ-basicity of the ligands
A number of examples are available in the literature regarding cyclic voltammetric studies of dinuclear copper(II) complexes with different donor sites[4,5,6,7,8,9], as far as we know, there is no information about the electrochemical behavior of dinuclear copper(II) compounds containing pseudohalides and bidentate amine ligands
Summary
Instituto de Química de Araraquara, UNESP, C.P. 355, 14801-970 Araraquara - SP, Brazil. Preparação, caracterização e o comportamento eletroquímico dos complexos: [Cu(N3)2(N,N-diEten)]2, [Cu(N3)2(tmeen)]2, [Cu(N3)(NCO)(N,N-diEten)]2, [Cu(N3)2(N,N’-diMeen)]2 e [Cu(N3)(NCO)(tmeen)]2 são apresentados e discutidos. Os voltamogramas cíclicos de todos complexos são semelhantes e apresentam um par de picos de corrente entre -0,65 e 0,0 V. A eletrólise a potencial controlado, em ≅ -0,55 V, forneceu 1,8 < n < 2,1 para todos os compostos, indicando a redução de Cu(II) a Cu(I) em ambos os centros metálicos. The complexes: [Cu(N3)2(N,N-diEten)]2, [Cu(N3)2(tmeen)]2, [Cu(N3)(NCO)(N,N-diEten)]2, [Cu(N3)2(N,N’-diMeen)]2 and [Cu(N3)(NCO)(tmeen)]2 were prepared, characterized and their electrochemical behavior was investigated by cyclic voltammetry and controlled potential electrolysis. Comparing the peak potential values for these complexes one can observe that the redox process corresponding to copper(II)/copper(I) couple is slightly influenced by the σ-basicity of the ligands
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