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Singlet excited state dynamics of uracil and thymine derivatives: A femtosecond fluorescence upconversion study in acetonitrile (78 visite)

Gustavsson T, Sarkar N, Lazzarotto E, Markovitsi D, Improta R

Chemical Physics Letters (ISSN: 0009-2614), 2006 Oct 5; 429(4-6): 551-557.

Tipo di articolo: Journal Article,

Impact factor: 2.462

Impact factor a 5 anni: 2.088


Parole chiave: Acetonitrile, Complexation, Fluorescence, Reaction Kinetics, Solutions, Spectroscopic Analysis, Ultraviolet Radiation, Excited State, Thymine, Uracil, Nitrogen Compounds,

Url: http://www.scopus.com/inward/record.url?eid=2-s2.0-33748894317&partnerID=40&md5=43cb43710a20e874ed24f2d2d8b8ae9d

The excited state properties of uracil, thymine and four analogous uracil compounds have been studied in acetonitrile by steady-state and time-resolved spectroscopy. The excited state lifetimes were measured using femtosecond UV fluorescence upconversion. The excited state lifetimes of uracil and its 1- and 3-methyl substituted derivatives are well described by one ultrafast (≤100 fs) component. Five substituted compounds show a more complex behavior, exhibiting longer excited state lifetimes and bi-exponential fluorescence decays. These longer decays are substantially faster in acetonitrile than in aqueous solution showing that the excited state deactivation mechanism is in part governed by the solvent. © 2006 Elsevier B.V. All rights reserved.
*** IBB - CNR ***

Laboratoire Francis Perrin, CEA/DSM/DRECAM/SPAM - CNRS URA 2453, CEA Saclay, F-91191 Gif-sur-Yvette, France

Dipartimento di Chimica, Universita Federico II, Complesso Universitario Monte S. Angelo, Via Cintia, I-80126 Napoli, Italy

Istituto Biostrutture e Bioimmagini, CNR, V. Mezzocannone 6, 80134 Napoli, Italy
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