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

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+ ( = 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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https://hal.archives-ouvertes.fr/hal-01009683
Contributor : Christophe Jouvet Connect in order to contact the contributor
Submitted on : Wednesday, June 25, 2014 - 11:29:12 AM
Last modification on : Tuesday, October 19, 2021 - 10:49:18 PM
Long-term archiving on: : Thursday, September 25, 2014 - 10:36:57 AM

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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, American Chemical Society, 2014, 5, 2295-2301 Reprinted (adapted) with permission from Journal of Physical Chemistry Letters. ⟨10.1021/jz5009455⟩. ⟨hal-01009683⟩

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