期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 114, 期 43, 页码 11432-11435出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp106301q
关键词
-
资金
- Ministry of Education, Science, and Technology [2010-0015806, 2010-0001635]
- BK21 scholarship
The excited-state double proton transfer of model DNA base pairs, 7-hydroxyquinoline chillers, in benzene has been investigated using picosecond time-resolved fluorescence spectroscopy. Upon excitation, whereas singly hydrogen-bonded noncyclic chillers do not go through tautomerization within the relaxation time of 1400 ps, doubly hydrogen-bonded cyclic dimers undergo excited-state double proton transfer on the time scale of 25 ps to form tautomeric dimers, which subsequently undergo a conformational change in 180 Ps to produce singly hydrogen-bonded tautomers. The rate constant of the double proton transfer reaction is temperature-independent, showing a large kinetic isotope effect of 5.2, suggesting that the rate is governed mostly by tunneling.
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