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Flash Photolysis Studies of Reversible Photoprocesses V. Photochromism and triplet states in the dianthrone system

✍ Scribed by Kurt H. Gschwind; Urs P. Wild

Publisher: John Wiley and Sons
Year: 1973
Tongue: German
Weight: 718 KB
Volume: 56
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.19730560302

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✦ Synopsis

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.

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