TY - JOUR
T1 - Energy conversion from proton gradient to electricity based on characteristic redox behavior of an aqua ruthenium complex with a quinone ligand
AU - Tsuge, Kiyoshi
AU - Kurihara, Masato
AU - Tanaka, Koji
PY - 2000/3
Y1 - 2000/3
N2 - A ruthenium aqua complex having a quinone ligand, [Ru(trpy)(dbq)(H2O)](ClO4)2 (trpy = 2,2':6',2-terpyridine, dbq = 3,5-di- t-butyl-1,2-benzoquinone) ([Ru(q)(H2O)](ClO4)2) was prepared. Its electrochemical properties and electronic absorption spectra were measured in the presence of a base in acetone. The detailed analysis of those measurements revealed that the addition of a base caused not only the deprotonation but also the reduction of [Ru(q)(H2O)]2+. The redox reactions coupled with acid-base reactions were demonstrated from the large difference in redox properties of aqua and hydroxo complexes. Taking advantage of unique redox reactions induced by the acid-base equilibrium between aqua andhydroxo complexes, we have succeeded in constructing the first energy transducer which converts the proton gradient to electricity. A similar ruthenium aqua complex with a bipyridine ligand, [Ru(trpy)(bpy)(H2O)](ClO4)2, also reversibly dissociates a proton of aqua ligand. However, it has no ability to convert the proton gradient to electricity due to the lack of a suitable molecular orbital which can accommodate electrons on the electron-rich hydroxo ligand.
AB - A ruthenium aqua complex having a quinone ligand, [Ru(trpy)(dbq)(H2O)](ClO4)2 (trpy = 2,2':6',2-terpyridine, dbq = 3,5-di- t-butyl-1,2-benzoquinone) ([Ru(q)(H2O)](ClO4)2) was prepared. Its electrochemical properties and electronic absorption spectra were measured in the presence of a base in acetone. The detailed analysis of those measurements revealed that the addition of a base caused not only the deprotonation but also the reduction of [Ru(q)(H2O)]2+. The redox reactions coupled with acid-base reactions were demonstrated from the large difference in redox properties of aqua and hydroxo complexes. Taking advantage of unique redox reactions induced by the acid-base equilibrium between aqua andhydroxo complexes, we have succeeded in constructing the first energy transducer which converts the proton gradient to electricity. A similar ruthenium aqua complex with a bipyridine ligand, [Ru(trpy)(bpy)(H2O)](ClO4)2, also reversibly dissociates a proton of aqua ligand. However, it has no ability to convert the proton gradient to electricity due to the lack of a suitable molecular orbital which can accommodate electrons on the electron-rich hydroxo ligand.
UR - http://www.scopus.com/inward/record.url?scp=0034023812&partnerID=8YFLogxK
U2 - 10.1246/bcsj.73.607
DO - 10.1246/bcsj.73.607
M3 - 学術論文
AN - SCOPUS:0034023812
SN - 0009-2673
VL - 73
SP - 607
EP - 614
JO - Bulletin of the Chemical Society of Japan
JF - Bulletin of the Chemical Society of Japan
IS - 3
ER -