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 language | English |
|---|---|
| Pages (from-to) | 53-59 |
| Number of pages | 7 |
| Journal | Bioelectrochemistry and Bioenergetics |
| Volume | 48 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Feb 1 1999 |
| Externally published | Yes |
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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 journal › Article
}
TY - JOUR
T1 - Redox characteristics of Schiff base manganese and cobalt complexes related to water-oxidizing complex of photosynthesis
AU - Hotchandani, S.
AU - Ozdemir, U.
AU - Nasr, C.
AU - Allakhverdiev, Suleyman
AU - Karacan, N.
AU - Klimov, V. V.
AU - Kamat, P. V.
AU - Carpentier, R.
PY - 1999/2/1
Y1 - 1999/2/1
N2 - 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.
AB - 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.
KW - Cobalt complex
KW - Cyclic voltammetry
KW - Manganese complex
KW - Photosystem II (PS II)
KW - Water-oxidizing complex (WOC)
UR - http://www.scopus.com/inward/record.url?scp=0032987255&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032987255&partnerID=8YFLogxK
U2 - 10.1016/S0302-4598(98)00235-9
DO - 10.1016/S0302-4598(98)00235-9
M3 - Article
C2 - 10228570
AN - SCOPUS:0032987255
VL - 48
SP - 53
EP - 59
JO - Bioelectrochemistry
JF - Bioelectrochemistry
SN - 1567-5394
IS - 1
ER -