title: Distance-dependent activation energies for hole injection from protonated 9-amino-6-chloro-2-methoxyacridine into duplex DNA.
abstract: The recent investigation of the apparently anomalous attenuation factor (beta > 1.5 A(-1)) for photoinduced hole injection into DNA duplexes modified by protonated 9-amino-6-chloro-2-methoxyacridine (X+) led to the conclusion that in addition to the electronic couplings, the activation energy must also be distance-dependent. In this communication we report the verification of this postulate by direct measurements of the activation energies for a series of (X+)-modified DNA duplexes which sample an appreciable range of donor-acceptor distances (approximately 4-11 A). The resulting changes in thermal activation energy can be explained within the framework of a distance-dependent reorganization energy.
authors.affiliation: Institut für Physikalische und Theoretische Chemie, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching, Germany.
authors.forename: William B
authors.initials: WB
authors.lastname: Davis
authors.forename: Stephan
authors.initials: S
authors.lastname: Hess
authors.forename: Izabela
authors.initials: I
authors.lastname: Naydenova
authors.forename: Reinhard
authors.initials: R
authors.lastname: Haselsberger
authors.forename: Alexander
authors.initials: A
authors.lastname: Ogrodnik
authors.forename: Marshall D
authors.initials: MD
authors.lastname: Newton
authors.forename: Maria-E
authors.initials: ME
authors.lastname: Michel-Beyerle
mesh_terms: D000609:Aminoacridines / Q000737:chemistry*; D004247:DNA / Q000737:chemistry*; D007364:Intercalating Agents / Q000737:chemistry*; D007700:Kinetics; D010777:Photochemistry; D011522:Protons; D013696:Temperature; D013816:Thermodynamics
chemical_list: D000609:Aminoacridines; D007364:Intercalating Agents; D011522:Protons; C010847:9-amino-6-chloro-2-methoxyacridine; D004247:DNA