Effect of Ag+ on the Excited-State Properties of a Gas-Phase (Cytosine)2Ag+ Complex: Electronic Transition and Estimated Lifetime
- Berdakin, Matias
- Féraud, Geraldine
- Dedonder Lardeux, Claude
- Jouvet, Christophe
- Pino, Gustavo Ariel
DOIAbstract
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 ...
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