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Reversible intramolecular proton-transfer reactions of electronically excited “double” benzoxazoles: A direct observation of the effect of the intrinsic barrier

✍ Scribed by Anna Grabowska; Andrzej Mordzinski; Naoto Tamai; Keitaro Yoshihara

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 539 KB
Volume: 169
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(90)87076-4

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✦ Synopsis

Picosecond kinetics of excited-state single-or double-proton transfer along intramolecular hydrogen bonds were analyzed for three molecules: 2,5-his-( 2-benzoxazolyl )hydroquinone, its monomethoxy-derivative and 3,6-bis-(bbenzoxazolyl)pyrocatechol. Forward and back proton-transfer rate constants were determined. They are all of the order of IO" s-', i.e. considerably lower than exoected for this class of reactions.

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