Excited State Dynamics of 6‑Thioguanine
Faady
M. Siouri
Samuel Boldissar
Jacob A. Berenbeim
Mattanjah S. de Vries
10.1021/acs.jpca.7b03036.s001
https://acs.figshare.com/articles/journal_contribution/Excited_State_Dynamics_of_6_Thioguanine/5179030
Here
we present the excited state dynamics of jet-cooled 6-thioguanine
(6-TG), using resonance-enhanced multiphoton ionization (REMPI), IR–UV
double resonance spectroscopy, and pump–probe spectroscopy
in the nanosecond and picosecond time domains. We report data on two
thiol tautomers, which appear to have different excited state dynamics.
These decay to a dark state, possibly a triplet state, with rates
depending on tautomer form and on excitation wavelength, with the
fastest rate on the order of 10<sup>10</sup> s<sup>–1</sup>. We also compare 6-TG with 9-enolguanine, for which we observed
decay to a dark state with a 2 orders of magnitude smaller rate. At
increased excitation energy (∼+500 cm<sup>–1</sup>)
an additional pathway appears for the predominant thiol tautomer.
Moreover, the excited state dynamics for 6-TG thiols is different
from that recently predicted for thiones.
2017-06-26 00:00:00
REMPI
picosecond time domains
6- TG thiols
state dynamics
IR
resonance-enhanced multiphoton ionization
Excited State Dynamics
tautomer