Showalter BM, Datta A, Chowdhury PK, Park J, Bandyopadhyay P, Choudhury PK, Kesavan S, Zeng Y, Kraus GA, Gordon MS, Toscano JP, Petrich JW. Identification of a vibrational frequency corresponding to H-atom translocation in hypericin.
Photochem Photobiol 2001;
74:157-63. [PMID:
11547549 DOI:
10.1562/0031-8655(2001)074<0157:ioavfc>2.0.co;2]
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Abstract
Using time-resolved infrared spectroscopy, ab initio quantum mechanical calculations and synthetic organic chemistry a region in the infrared spectrum of triplet hypericin has been found between 1400 and 1500 cm-1 corresponding to the translocation of the hydrogen atom between the enol and the keto 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.
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