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

Gschwind Kurt H. | Zendy; Wild Urs P. | Zendy

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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

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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