Ontology highlight
ABSTRACT:
SUBMITTER: Kwon OH
PROVIDER: S-EPMC1885566 | biostudies-literature | 2007 May
REPOSITORIES: biostudies-literature
Kwon Oh-Hoon OH Zewail Ahmed H AH
Proceedings of the National Academy of Sciences of the United States of America 20070514 21
The dynamics of excited-state double proton transfer of model DNA base pairs, 7-azaindole dimers, is reported using femtosecond fluorescence spectroscopy. To elucidate the nature of the transfer in the condensed phase, here we examine variation of solvent polarity and viscosity, solute concentration, and isotopic fractionation. The rate of proton transfer is found to be significantly dependent on polarity and on the isotopic composition in the pair. Consistent with a stepwise mechanism, the resu ...[more]