1. Effect of Ag+ on the Excited-State Properties of a Gas-Phase (Cytosine)2Ag+ Complex: Electronic Transition and Estimated Lifetime
- Author
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Claude Dedonder-Lardeux, Géraldine Féraud, Matias Berdakin, Gustavo A. Pino, Christophe Jouvet, Instituto de Investigaciones en Físico Química [Córdoba] (INFIQC), Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] (CONICET)-Facultad de Ciencias Químicas [Córdoba], Universidad Nacional de Córdoba [Argentina]-Universidad Nacional de Córdoba [Argentina], Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), ECOS-MinCyT cooperation program (A11E02), and ANR-10-BLAN-0405,ESPM,Etats excités des molécules protonées(2010)
- Subjects
Pyrimidine ,Photochemistry ,metal-mediated base pairs ,Molecular electronic transition ,Nucleobase ,purl.org/becyt/ford/1 [https] ,chemistry.chemical_compound ,DNA−Agn cluster ,excited state ,purl.org/becyt/ford/1.4 [https] ,Molecule ,General Materials Science ,Physical and Theoretical Chemistry ,Physics::Biological Physics ,Quantitative Biology::Biomolecules ,Otras Ciencias Químicas ,[PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus] ,Ciencias Químicas ,Quantitative Biology::Genomics ,Fluorescence ,DNA bases ,DNA-Agn cluster ,chemistry ,Excited state ,Atomic physics ,CIENCIAS NATURALES Y EXACTAS ,Excitation ,Cytosine ,photofragmentation spectroscopy - Abstract
Recently, DNA molecules have received great attention because of their potential applications in material science. One interesting example is the production of highly fluorescent and tunable DNA–Agn clusters with cytosine (C)-rich DNA strands. Here, we report the UV photofragmentation spectra of gas-phase cytosine···Ag+···cytosine (C2Ag+) and cytosine···H+···cytosine (C2H+) complexes together with theoretical calculations. In both cases, the excitation energy does not differ significantly from that of isolated cytosine or protonated cytosine, indicating that the excitation takes place on the DNA base. However, the excited-state lifetime of the C2H+ (τ = 85 fs), estimated from the bandwidth of the spectrum, is at least 2 orders of magnitude shorter than that of the C2Ag+ (τ > 5000 fs). The increased excited-state lifetime upon silver complexation is quite unexpected, and it clearly opens the question about what factors are controlling the nonradiative decay in pyrimidine DNA bases. This is an important result for the expanding field of metal-mediated base pairing and may also be important to the photophysical properties of DNA-templated fluorescent silver clusters. Fil: Berdakin, Matias. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Féraud, Geraldine. Aix Marseille Université. Marsella; Francia Fil: Dedonder Lardeux, Claude. Aix Marseille Université. Marsella; Francia Fil: Jouvet, Christophe. Aix Marseille Université. Marsella; Francia Fil: Pino, Gustavo Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
- Published
- 2014
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