Redox characteristics of Schiff base manganese and cobalt complexes related to water-oxidizing complex of photosynthesis

S. Hotchandani, U. Ozdemir, C. Nasr, Suleyman Allakhverdiev, N. Karacan, V. V. Klimov, P. V. Kamat, R. Carpentier

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

In an effort to obtain synthetic analogues of water-oxidizing complex (WOC) of photosystem II (PS II) of plant photosynthesis, a Schiff base manganese and a cobalt complex, employing Niten, a SALEN type ligand, have been prepared. Cyclic and square wave voltammetric measurements have been performed to assess their redox characteristics. Both complexes undergo several reduction processes in cathodic negative potential region at more or less similar potentials. In view of these reductions being independent of the nature of the metal, they are thought to be ligand-localized. Although similar in negative region, a marked difference in the behavior of the complexes is observed in anodic region. While the cobalt complex is electrochemically inactive in the positive potentials up to +1.0 V vs. Ag/AgCl, the manganese complex displays two oxidation waves at +0.25 and +0.5 V vs. Ag/AgCl. The presence of oxidation wave in manganese complex at +0.5 V vs. Ag/AgCl or +0.7 V vs. NHE suggests that this complex can catalyze the oxidation of water and can, thus, simulate the WOC of PS II. Copyright (C) 1999 Elsevier Science S.A.

Original languageEnglish
Pages (from-to)53-59
Number of pages7
JournalBioelectrochemistry and Bioenergetics
Volume48
Issue number1
DOIs
Publication statusPublished - Feb 1 1999
Externally publishedYes

Fingerprint

photosynthesis
Schiff Bases
Photosynthesis
Manganese
Cobalt
imines
Oxidation-Reduction
manganese
Photosystem II Protein Complex
cobalt
Oxidation
oxidation
Water
Ligands
water
ligands
square waves
Metals
analogs
metals

Keywords

  • Cobalt complex
  • Cyclic voltammetry
  • Manganese complex
  • Photosystem II (PS II)
  • Water-oxidizing complex (WOC)

ASJC Scopus subject areas

  • Biophysics
  • Physical and Theoretical Chemistry
  • Electrochemistry

Cite this

Redox characteristics of Schiff base manganese and cobalt complexes related to water-oxidizing complex of photosynthesis. / Hotchandani, S.; Ozdemir, U.; Nasr, C.; Allakhverdiev, Suleyman; Karacan, N.; Klimov, V. V.; Kamat, P. V.; Carpentier, R.

In: Bioelectrochemistry and Bioenergetics, Vol. 48, No. 1, 01.02.1999, p. 53-59.

Research output: Contribution to journalArticle

Hotchandani, S, Ozdemir, U, Nasr, C, Allakhverdiev, S, Karacan, N, Klimov, VV, Kamat, PV & Carpentier, R 1999, 'Redox characteristics of Schiff base manganese and cobalt complexes related to water-oxidizing complex of photosynthesis', Bioelectrochemistry and Bioenergetics, vol. 48, no. 1, pp. 53-59. https://doi.org/10.1016/S0302-4598(98)00235-9
Hotchandani, S. ; Ozdemir, U. ; Nasr, C. ; Allakhverdiev, Suleyman ; Karacan, N. ; Klimov, V. V. ; Kamat, P. V. ; Carpentier, R. / Redox characteristics of Schiff base manganese and cobalt complexes related to water-oxidizing complex of photosynthesis. In: Bioelectrochemistry and Bioenergetics. 1999 ; Vol. 48, No. 1. pp. 53-59.
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