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, S. I.
AU - Karacan, N.
AU - Klimov, V. V.
AU - Kamat, P. V.
AU - Carpentier, R.
N1 - Funding Information:
We would like to thank the Natural Sciences and Engineering Research Council of Canada NSERC (S.H. and R.C.) for financial support. S.I.A. was the recipient of NSERC International Scientific Exchange Award. P.V.K. is supported by the Office of the Basic Energy Sciences of the US Department of Energy. This is contribution NDRL 4026 from the Notre Dame Radiation Laboratory.
PY - 1999/2
Y1 - 1999/2
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 and Bioenergetics
JF - Bioelectrochemistry and Bioenergetics
SN - 1567-5394
IS - 1
ER -