Ultrafast Intersystem Crossing Dynamics of 6-Selenoguanine in Water

Danillo Valverde, Sebastian Mai, Sylvio Canuto, Antonio Carlos Borin, Leticia González

Résultats de recherche: Contribution à un journal/une revueArticleRevue par des pairs

Résumé

Rationalizing the photochemistry of nucleobases where an oxygen is replaced by a heavier atom is essential for applications that exploit near-unity triplet quantum yields. Herein, we report on the ultrafast excited-state deactivation mechanism of 6-selenoguanine (6SeGua) in water by combining nonadiabatic trajectory surface-hopping dynamics with an electrostatic embedding quantum mechanics/molecular mechanics (QM/MM) scheme. We find that the predominant relaxation mechanism after irradiation starts on the bright singlet S2state that converts internally to the dark S1state, from which the population is transferred to the triplet T2state via intersystem crossing and finally to the lowest T1state. This S2→ S1→ T2→ T1deactivation pathway is similar to that observed for the lighter 6-thioguanine (6tGua) analogue, but counterintuitively, the T1lifetime of the heavier 6SeGua is shorter than that of 6tGua. This fact is explained by the smaller activation barrier to reach the T1/S0crossing point and the larger spin-orbit couplings of 6SeGua compared to 6tGua. From the dynamical simulations, we also calculate transient absorption spectra (TAS), which provide two time constants (τ1= 131 fs and τ2= 191 fs) that are in excellent agreement with the experimentally reported value (τexp= 130 ± 50 fs) (Farrel et al. J. Am. Chem. Soc. 2018, 140, 11214). Intersystem crossing itself is calculated to occur with a time scale of 452 ± 38 fs, highlighting that the TAS is the result of a complex average of signals coming from different nonradiative processes and not intersystem crossing alone.

langue originaleAnglais
Pages (de - à)1699-1711
Nombre de pages13
journalJournal of the American Chemical Society
Volume2
Numéro de publication7
Les DOIs
Etat de la publicationPublié - 25 juil. 2022
Modification externeOui

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