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

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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.