Identification of a vibrational frequency corresponding to H-atom translocation in hypericin

Authors
Showalter, BM Datta, A Chowdhury, PK Park, J Bandyopadhyay, P Choudhury, PK Kesavan, S Zeng, Y Kraus, GA Gordon, MS Toscano, JP Petrich, JW
Citation
Bm. Showalter et al., Identification of a vibrational frequency corresponding to H-atom translocation in hypericin, PHOTOCHEM P, 74(2), 2001, pp. 157-163
Citations number
55
Categorie Soggetti
Biochemistry & Biophysics
Journal title
PHOTOCHEMISTRY AND PHOTOBIOLOGY
ISSN journal
00318655 → ACNP
Volume
74
Issue
2
Year of publication
2001
Pages
157 - 163
Database
ISI
SICI code
0031-8655(200108)74:2<157:IOAVFC>2.0.ZU;2-J
Abstract
Using time-resolved infrared spectroscopy, ab initio quantum mechanical cal culations and synthetic organic chemistry a region in the infrared spectrum of triplet hypericin has been found between 1400 and 1500 cm(-1) correspon ding to the translocation of the hydrogen atom between the enol and the ket o oxygens, O . . .H . . .O. This result is discussed in the context of the photophysics of hypericin and of eventual measurements to observe directly the excited-state H-atom transfer.