Redox characteristics of manganese and cobalt complexes obtained from pyridine N-oxide

• Published in: Bioelectrochemistry (Amsterdam, Netherlands) Vol. 51; no. 2; pp. 175 - 180
• Main Authors: Hotchandani, S, Ozdemir, U, Allakhverdiev, S.I, Karacan, N, Klimov, V.V, Kamat, P.V, Carpentier, R
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01-06-2000
• Subjects: Cobalt - chemistry; Cobalt complex; Cyclic voltammetry; Electrochemistry; Manganese - chemistry; Manganese complex; Oxidation-Reduction; Photosystem II (PS II); Pyridines - chemistry; Redox characteristics; Water oxidizing complex (WOC); Cyclic voltammetry; Cobalt complex; Manganese complex; Water oxidizing complex (WOC); Photosystem II (PS II); Redox characteristics
• ISSN: 1567-5394; 1878-562X
• DOI: 10.1016/S0302-4598(00)00068-4

Manganese and cobalt complexes, using pyridine N-oxide as ligand, have been synthesized, and their cyclic and square-wave voltammetric measurements have been carried out. The results reveal that the complexes exhibit different voltammetric pattern, which suggests that the redox processes are most probably metal-centered. In both complexes, extra redox activity is observed once the potential exceeds certain value of the voltage. The observation of an oxidation wave in manganese complex at +0.75 V vs. Ag/AgCl or +0.95 V vs. NHE strongly suggests that this complex can bring about oxidation of water and can, thus, serve as a synthetic analogue of water oxidizing complex (WOC) of PS II.