TY - GEN
T1 - Reversible conversion between chemical and electrical energies catalyzed by Ru complexes aimed to construct sustainable society
AU - Tanaka, Koji
AU - Wada, Tohru
AU - Fujita, Etsuko
AU - Muckerman, James T.
PY - 2008/12/1
Y1 - 2008/12/1
N2 - Reversible conversion between carbon dioxide and MeOH through six-electron redox reactions is one of the feasible pathway to construct renewable societies. Metal complexes that can oxide MeOH at potentials more negative than four-electron reduction of dioxygen are candidates for the electrode materials in fuel-cells. An aqua-Ru complex having a quinone ligand (pKa = 5.5) exists as the hydroxy analog (pKa ca. 11) in neutral water, and the latter is converted to an oxyl radical complex with a semiquinone ligand in highly basic solutions due to the electron flow from the deprotonated hydroxy group to the quinone ligand. On the other hand, an Ru-aminyl radical complex with quinone derived from the corresponding Ru-amine one works as an active catalyst in the electrochemical oxidation of MeOH in the presence of base at 0.3 V (vs. SCE). We will also discuss the electrochemical reduction of carbon dioxide catalyzed by Ru complexes in the symposium.
AB - Reversible conversion between carbon dioxide and MeOH through six-electron redox reactions is one of the feasible pathway to construct renewable societies. Metal complexes that can oxide MeOH at potentials more negative than four-electron reduction of dioxygen are candidates for the electrode materials in fuel-cells. An aqua-Ru complex having a quinone ligand (pKa = 5.5) exists as the hydroxy analog (pKa ca. 11) in neutral water, and the latter is converted to an oxyl radical complex with a semiquinone ligand in highly basic solutions due to the electron flow from the deprotonated hydroxy group to the quinone ligand. On the other hand, an Ru-aminyl radical complex with quinone derived from the corresponding Ru-amine one works as an active catalyst in the electrochemical oxidation of MeOH in the presence of base at 0.3 V (vs. SCE). We will also discuss the electrochemical reduction of carbon dioxide catalyzed by Ru complexes in the symposium.
UR - http://www.scopus.com/inward/record.url?scp=77955593130&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77955593130&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:77955593130
SN - 9780841269859
T3 - ACS National Meeting Book of Abstracts
BT - American Chemical Society - 235th National Meeting, Abstracts of Scientific Papers
T2 - 235th National Meeting of the American Chemical Society, ACS 2008
Y2 - 6 April 2008 through 10 April 2008
ER -