✦ LIBER ✦

Visible and infrared spectroscopy of intramolecular proton transfer using picosecond laser pulses

✍ Scribed by T. Elsaesser; W. Kaiser

Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 586 KB
Volume: 128
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(86)80331-1

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✦ Synopsis

Intramolecular proton transfer in the excited electronic state of 2-(2-hydroxyphenyl)-benzothiaxole (HBT) is investigated on the picosecond time scale. A Stokes shift of approximately 10000 cm-' between the absorption and the fluorescence maximum and a fluorescence quantum yield of 1.5% are found for HBT in C,Cl,. A fluorescent state S' is formed within 6 ps after excitation. In the excited molecule two new infrared bands are detected which correspond to NH and GO stretching vibrations. These data give direct proof of proton transfer. The spectroscopic data suggest that the potential energy surface of the transferred proton is very anharmonic.

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