Distance-dependent activation energies for hole injection from protonated 9-amino-6-chloro-2-methoxyacridine into duplex DNA.
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.
Davis
William B
WB
Institut für Physikalische und Theoretische Chemie, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching, Germany.
Hess
Stephan
S
Naydenova
Izabela
I
Haselsberger
Reinhard
R
Ogrodnik
Alexander
A
Newton
Marshall D
MD
Michel-Beyerle
Maria-E
ME
D000609:Aminoacridines / Q000737:chemistry*; D004247:DNA / Q000737:chemistry*; D007364:Intercalating Agents / Q000737:chemistry*; D007700:Kinetics; D010777:Photochemistry; D011522:Protons; D013696:Temperature; D013816:Thermodynamics
D000609:Aminoacridines; D007364:Intercalating Agents; D011522:Protons; C010847:9-amino-6-chloro-2-methoxyacridine; D004247:DNA