title: Long-range electron transfer over 4 nm governed by an inelastic hopping mechanism in self-assembled monolayers of helical peptides.
abstract: Well-ordered self-assembled monolayers (SAMs) were prepared on gold from helical peptides carrying a ferrocene (Fc) moiety at the N- or C-terminal end, and long-range electron transfer (ET) from Fc to gold was investigated. Electrochemical studies revealed that an inelastic hopping mechanism dominated over the superexchange mechanism in the ET reactions in the present SAMs and the dipole moment of the helix accelerated the ET reactions probably due to the lowering of the barrier height between the gold surface and peptide layer.
authors.affiliation: Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Yoshida Honmachi, Sakyo-ku, Kyoto 606-8501, Japan.
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Morita
authors.forename: Shunsaku
authors.initials: S
authors.lastname: Kimura
mesh_terms: D004220:Disulfides / Q000737:chemistry / Q000378:metabolism; D004563:Electrochemistry / Q000379:methods; D005296:Ferrous Compounds / Q000737:chemistry* / Q000378:metabolism; D006046:Gold / Q000737:chemistry; D000075163:Metallocenes; D010084:Oxidation-Reduction; D010455:Peptides / Q000737:chemistry* / Q000378:metabolism*; D017433:Protein Structure, Secondary
chemical_list: D004220:Disulfides; D005296:Ferrous Compounds; D000075163:Metallocenes; D010455:Peptides; D006046:Gold; C004998:ferrocene