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Flash Photolysis Studies of Reversible Photoprocesses V. Photochromism and triplet states in the dianthrone system
Author(s) -
Gschwind Kurt H.,
Wild Urs P.
Publication year - 1973
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19730560302
Subject(s) - photochromism , chemistry , flash photolysis , photochemistry , methylcyclohexane , triplet state , ultrafast laser spectroscopy , excited state , singlet state , benzophenone , spectroscopy , kinetics , molecule , reaction rate constant , organic chemistry , atomic physics , physics , quantum mechanics , catalysis
Abstract The kinetics of the formation of the photochromic forms B and C of tetramethyl‐dianthrone has been studied in triacetin and methylcyclohexane/2‐methylpentane at several temperatures. A flash spectroscopy method was developed, which allows the recording of the transient behaviour of the sample as function of both – wavelength and time – using a single photoflash for excitation. The results show that the photochromic forms B and C are directly populated from the excited singlet state. In addition a new triplet‐triplet absorption band in the near infrared region was detected.