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Solvent effects on electron-driven proton-transfer processes: Adenine-thymine base pairs (48 views)

Dargiewicz M, Biczysko M, Improta R, Barone V

Phys Chem Chem Phys (ISSN: 1463-9076, 1463-3907, 1463-9084electronic), 2012; 14(25): 8981-8989.

Abstract
Time-Dependent Density Functional Theory (TD-DFT) computations, with M05-2X and PBE0 functionals, have been employed for a detailed study of the Electron-Driven Proton-Transfer (PT) processes in an Adenine-Thymine Watson-Crick Base Pair in the gas phase and in solution, with the bulk solvent described by the polarizable continuum model. In the gas phase, TD-DFT computations predict that the Adenine → Thymine Charge Transfer (CT) excited state undergoes a barrierless PT reaction, in agreement with CC2 computations (S. Perun, A. Sobolewski, W. Domcke, J. Phys. Chem. A, 2006, 110, 9031.). The good agreement between the TD-DFT approach and CC2 results validates the former for the studies of excited state properties, excited state proton transfer reaction, and deactivation mechanisms in the DNA base pairs. Next, it is shown that inclusion of solvent effects significantly influences the possibility of both barrier-less excited state proton transfer and radiation-less deactivation through conical intersection with the ground state, affecting the energy of the CT excited state in the Franck-Condon region, the energy barrier associated to the PT process and the energy gap with the ground electronic state. These findings clearly indicate that environmental effects, with a special attention to proper treatment of dynamical solvation effects, have to be included for reliable computational analysis of photophysical and photochemical processes occurring in condensed phases. © 2012 the Owner Societies.

Affiliations ▼
*** IBB - CNR Affiliation

Dipartimento di Chimica Paolo Corradini, INSTM Village, Complesso Univ. Monte S. Angelo, via Cintia, 80126 Napoli, Italy

Center for Nanotechnology Innovation at NEST, Istituto Italiano di Tecnologia, Piazza San Silvestro 12, I-56127 Pisa, Italy

Istituto Biostrutture e Bioimmagini-CNRs, Via Mezzocannone 16, 80134 Napoli, Italy

Scuola Normale Superiore, piazza dei Cavalieri 7, 56126 Pisa, Italy

Details ▼
Impact factor: 3.829, 5-year impact factor: 3.976

Paper type: Journal Article,

Keywords: Adenine, Proton, Solvent, Thymine, Article, Base Pairing, Chemical Structure, Chemistry, Electron, Quantum Theory, Gases, Models, Molecular,

Url: http://www.scopus.com/inward/record.url?eid=2-s2.0-84862292644&partnerID=40&md5=73dfe0365d97fef2ebeadf50753c8231

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5 Records (5 excluding Abstracts and Conferences).
Total impact factor: 29.761 (29.761 excluding Abstracts and Conferences).
Total 5-year impact factor: 28.773 (28.773 excluding Abstracts and Conferences).



Your bibliography query: (([btitle, keywords, abstract] ADENINE AND [btitle, keywords, abstract] PROTON)) AND NOT [id] = 10619



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