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THE SPECTROSCOPY AND PHOTOCHEMISTRY OF NATURALLY OCCURRING AND SYNTHETIC CHROMENES
Author(s) -
KOLC JAROSLAV,
BECKER RALPH S.
Publication year - 1970
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1970.tb06069.x
Subject(s) - benzophenone , photochemistry , chemistry , phosphorescence , coumarin , photochromism , moiety , carbonyl group , spectroscopy , fluorescence , organic chemistry , stereochemistry , physics , quantum mechanics
— –All naturally occurring and synthetic chromenes studied exhibit photochromism at — 196°C and in some cases at room temperature. Chromenes containing a coumarin moiety have the least photochemistry and also exhibit the strongest emissions. Chromenes containing a hydroxyl group ortho to an acetyl group exhibit solely a phosphorescence. Lapachenole (a 7,8‐benzochromene) shows the most rapid and highest percentage conversion to the colored form and no emission. Photocolored form of evodione can be produced by a triplet energy transfer from benzophenone.