Superior electron-transport ability of pi-conjugated redox molecular wires prepared by the stepwise coordination method on a surface.
Electronic conductivity of molecular wires is a critical fundamental issue in molecular electronics. pi-Conjugated redox molecular wires with the superior long-range electron-transport ability could be constructed on a gold surface through the stepwise ligand-metal coordination method. The beta(d) value, indicating the degree of decrease in the electron-transfer rate constant with distance along the molecular wire between the electrode and the redox active species at the terminal of the wire, were 0.008-0.07 A(-1) and 0.002-0.004 A(-1) for molecular wires of bis(terpyridine)iron and bis(terpyridine)cobalt complex oligomers, respectively. The influences on beta(d) by the chemical structure of molecular wires and the terminal redox units, temperature, electric field, and electrolyte concentration were clarified. The results indicate that facile sequential electron hopping between neighboring metal-complex units within the wire is responsible for the high electron-transport ability.
Nishimori
Yoshihiko
Y
Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Kanaizuka
Katsuhiko
K
Kurita
Tomochika
T
Nagatsu
Toshiaki
T
Segawa
Yu
Y
Toshimitsu
Fumiyuki
F
Muratsugu
Satoshi
S
Utsuno
Mitsuya
M
Kume
Shoko
S
Murata
Masaki
M
Nishihara
Hiroshi
H
D055664:Electrochemical Techniques / Q000379:methods*; D004579:Electron Transport; D005296:Ferrous Compounds / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D000075163:Metallocenes; D009942:Organometallic Compounds / Q000737:chemistry*; D010084:Oxidation-Reduction; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D011725:Pyridines / Q000737:chemistry*; D013499:Surface Properties; D013816:Thermodynamics
D005296:Ferrous Compounds; D000075163:Metallocenes; D009942:Organometallic Compounds; D011108:Polymers; D011725:Pyridines; C445104:bis(terpyridine)cobalt(II) chloride; D007501:Iron; C004998:ferrocene