Dimeric %26quot;paddle-wheel%26quot; carboxylates of copper(II): Synthesis, crystal structure and electrochemical studies

作者：Iqbal Muhammad; Ahmad Iqbal; Ali Saqib^*; Muhammad Niaz; Ahmed Safeer; Sohail Manzar

来源：Polyhedron, 2013, 50(1): 524-531.

DOI：10.1016/j.poly.2012.11.037

• Copper carboxylates
• Dimeric complexes
• Crystal structure
• Cyclic voltammetry
• Diffusing coefficient
• Heterogeneous kinetics

The reaction of the sodium salt of para substituted phenyl acetic acid with CuSO4 in water and subsequent treatment with pyridine gives binuclear centro-symmetric complexes pyCu(R-C6H4CH2COO)(4)-Cupy, where R =4-OMe (1) and 4-Cl- (2). The structures of both complexes were solved by X-ray single crystal analysis. The frame of the complexes is constructed as a dimeric %26apos;paddle-wheel%26apos; with four carboxylate bridges. The apical position is occupied by a pyridine ligand and there is a Cu-Cu bond as well. The compounds demonstrated one-electron redox behavior and their peak currents were found to increase linearly with the square root of the sweep rate (nu(1/2)). The overall electrode processes were found to be activation plus diffusion controlled. The values of the formal potential (E%26apos;), diffusion coefficient (D) and heterogeneous rate constant (k degrees) were evaluated for the electroreduction process for both the compounds.

• 出版日期2013-2-13