Ultrafast deactivation processes in aminopyridine clusters: Excitation energy dependence and isotope effects
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- Ultrafast deactivation processes in aminopyridine clusters: Excitation energy dependence and isotope effects
- Samoylova, E.; Smith, V. R.; Ritze, H. -H.; Radloff, W.; Kabelac, M.; Schultz, Thomas
- PROTON-TRANSFER PROCESSES; BASE-PAIRS; AB-INITIO; MOLECULAR-DYNAMICS; ADENINE-THYMINE; STATE; SPECTROSCOPY; 2-AMINOPYRIDINE; SELECTIVITY
- Issue Date
- AMER CHEMICAL SOC
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.128, no.49, pp.1562 - 1565
- Fast excited-state relaxation in H-bonded aminopyridine clusters occurs via hydrogen transfer in the excited state. We used femtosecond pump-probe spectroscopy to characterize the excited-state reaction coordinate. Considerable isotope effects for partially deuterated clusters indicate that H-transfer is the rate-limiting step and validate ab initio calculations in the literature. A nonmonotonous dependence on the excitation energy, however, disagrees with the picture of a simple barrier along the reaction coordinate. An aminopyridine dimer serves as a model for Watson-Crick base pairs, where similar reactions have been predicted by theory.
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