Abstract
The redox properties of the title mono- and binuclear copper(II) chelates have been investigated by cyclic voltammetry in DMF at a working platinum electrode. The cathodic reduction and anodic oxidation of the investigated chelates produced the corresponding electrochemical CuI and CuIIIspecies stable only in the voltammetric time scale, The effects of substituents on E1/2, redox properties and stability towards oxidation of the complexes were related to the electron-withdrawing or releasing ability of the substituents on the C=N1[H, CH3 or C6H5] and/or N4H [H, C2H5, C6H5 or pClC6H4] groups, The electron attracting substituents stabilize the Cu(II) complexes while electron-donating groups favor oxidation to Cu(III). Changes in the E1/2 for the complexes due to remote substituent effects could be related to changes in basicity of N4H.Thus, variation in N41-J has more influence on E1/2 than changes in C=N1. The correlation between E1/2 of the complexes and pK a of the ligands has been attributed to the spherical potential generated by the electron density of the donor atoms at the antibonding d orbitals.
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Al-Hazmi, G.A., El-Shahawi, M.S. & El-Asmy, A.A. Ligand influence on the electrochemical behavior of some copper(II) thiosemicarbazone complexes. Transition Met Chem 30, 464–470 (2005). https://doi.org/10.1007/s11243-005-2362-x
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DOI: https://doi.org/10.1007/s11243-005-2362-x