title: Identification of a vibrational frequency corresponding to H-atom translocation in hypericin.
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.
authors.affiliation: Department of Chemistry, Johns Hopkins University, Baltimore, MD, USA.
authors.forename: B M
authors.initials: BM
authors.lastname: Showalter
authors.forename: A
authors.initials: A
authors.lastname: Datta
authors.forename: P K
authors.initials: PK
authors.lastname: Chowdhury
authors.forename: J
authors.initials: J
authors.lastname: Park
authors.forename: P
authors.initials: P
authors.lastname: Bandyopadhyay
authors.forename: P K
authors.initials: PK
authors.lastname: Choudhury
authors.forename: S
authors.initials: S
authors.lastname: Kesavan
authors.forename: Y
authors.initials: Y
authors.lastname: Zeng
authors.forename: G A
authors.initials: GA
authors.lastname: Kraus
authors.forename: M S
authors.initials: MS
authors.lastname: Gordon
authors.forename: J P
authors.initials: JP
authors.lastname: Toscano
authors.forename: J W
authors.initials: JW
authors.lastname: Petrich
mesh_terms: D000873:Anthracenes; D066298:In Vitro Techniques; D010569:Perylene / Q000031:analogs & derivatives* / Q000737:chemistry* / Q000494:pharmacology; D010777:Photochemistry; D017319:Photosensitizing Agents / Q000737:chemistry / Q000494:pharmacology; D013055:Spectrophotometry, Infrared
chemical_list: D000873:Anthracenes; D017319:Photosensitizing Agents; D010569:Perylene; C004965:hypericin