title: Experimental evidence for water mediated electron transfer through bis-amino acid donor-bridge-acceptor oligomers.
abstract: This work compares the photoinduced unimolecular electron transfer rate constants for two different solute molecules (D-SSS-A and D-SRR-A) in water and DMSO solvents. The D-SSS-A solute has a cleft between the electron donor and acceptor units, which is able to contain a water molecule but is too small for DMSO. The rate constant for D-SSS-A in water is significantly higher than that for D-SRR-A, which lacks a cleft, and significantly higher for either solute in DMSO. The enhancement of the rate constant is explained by an electron tunneling pathway that involves water molecule(s).
authors.affiliation: University of Pittsburgh, Department of Chemistry, Pittsburgh, Pennsylvania 15260, USA.
authors.forename: Subhasis
authors.initials: S
authors.lastname: Chakrabarti
authors.forename: Matthew F L
authors.initials: MF
authors.lastname: Parker
authors.forename: Christopher W
authors.initials: CW
authors.lastname: Morgan
authors.forename: Christian E
authors.initials: CE
authors.lastname: Schafmeister
authors.forename: David H
authors.initials: DH
authors.lastname: Waldeck
mesh_terms: D000577:Amides / Q000737:chemistry; D000596:Amino Acids / Q000737:chemistry*; D000814:Aniline Compounds / Q000737:chemistry; D007692:Diatomaceous Earth; D004121:Dimethyl Sulfoxide / Q000737:chemistry; D004583:Electrons; D006860:Hydrogen Bonding; D008958:Models, Molecular; D011721:Pyrenes / Q000737:chemistry; D013816:Thermodynamics; D014867:Water / Q000737:chemistry*
chemical_list: D000577:Amides; D000596:Amino Acids; D000814:Aniline Compounds; D011721:Pyrenes; D014867:Water; D007692:Diatomaceous Earth; D004121:Dimethyl Sulfoxide