Journal
CHEMICAL PHYSICS LETTERS
Volume 367, Issue 5-6, Pages 599-608Publisher
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DOI: 10.1016/S0009-2614(02)01741-4
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A femtosecond fluorescence upconversion study is reported for HBO in solution, as well as for HBO incorporated in DNA. The typical time for the excited-state intramolecular proton-transfer reaction of the syn-enol tautomer in solution and in DNA has been determined to be 150 fs. In addition, the lifetimes of the keto, the anti-enol and the 'solvated enol' tautomer forms were determined in protic solvents, aprotic solvents and DNA. Picosecond rise and decay components in the fluorescence transients with characteristic times between 3 and 25 ps are also observed and attributed to the effects of vibrational cooling. (C) 2002 Published by Elsevier Science B.V.
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