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Article Dans Une Revue Journal of Physical Chemistry Letters Année : 2014

The Effect of Ag+ on the Excited State Properties of Gas Phase (Cytosine)2Ag+ Complex: Electronic Transition and Estimated Lifetime

Résumé

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+ ( = 85 fs), estimated from the bandwidth of the spectrum, is at least two orders of magnitude shorter than that of the C2Ag+ ( > 5300 fs). The increased excited state lifetime upon silver complexation is quite unexpected and it clearly opens the question about what factors are controlling the non-radiative 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.
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Dates et versions

hal-01009683 , version 1 (25-06-2014)

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Matias Berdakin, Géraldine Féraud, Claude Dedonder-Lardeux, Christophe Jouvet, Gustavo A. Pino. The Effect of Ag+ on the Excited State Properties of Gas Phase (Cytosine)2Ag+ Complex: Electronic Transition and Estimated Lifetime. Journal of Physical Chemistry Letters, 2014, 5, 2295-2301 Reprinted (adapted) with permission from Journal of Physical Chemistry Letters. ⟨10.1021/jz5009455⟩. ⟨hal-01009683⟩
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