Photoinduced dynamics of guanosine monophosphate in water from broad-band transient absorption spectroscopy and quantum-chemical calculations.

@article{Karunakaran2009PhotoinducedDO,
  title={Photoinduced dynamics of guanosine monophosphate in water from broad-band transient absorption spectroscopy and quantum-chemical calculations.},
  author={Venugopal Karunakaran and Karl Kleinermanns and Roberto Improta and Sergey A Kovalenko},
  journal={Journal of the American Chemical Society},
  year={2009},
  volume={131 16},
  pages={5839-50}
}
Guanosine monophosphate (GMP) in aqueous solutions has been studied with femtosecond broad-band transient absorption spectroscopy and by quantum-mechanical calculations. The sample was excited at 267 or 287 nm and probed between 270 and 1000 nm with 100 fs resolution, for various pH values between 2 and 7. At pH 2, when the guanine ring is ground-state protonated (GMPH(+)), we observe isosbestic behavior indicating state-to-state relaxation. The relaxation is biexponential, tau(1) = 0.4 ps, tau… CONTINUE READING
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