✦ LIBER ✦

Photochromism of 1-(1-naphthoxy)anthraquinones

✍ Scribed by Masahiro Tajima; Makoto Tokoro; Haruo Inoue

Book ID: 103994238
Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 411 KB
Volume: 84
Category: Article
ISSN: 1010-6030
DOI: 10.1016/1010-6030(94)03852-x

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✦ Synopsis

The photochromic behavior of I-(1-naphthoxy)anthraquinone (1) has been newly investigated.

Upon UV light irradiation, the color of a benzene solution of 1 turned from pale yellow to orange. The quantum yield of the coloration was 0.05. The excited singlet state was revealed to be responsible for the coloration.

The decay of the colored species obeyed good first-order kinetics and consisted of two processes&e. the reversion to the starting substance and the change toward final formation of 1-hydroxyanthraquinone.

The activation enthalpy of the process of reversion to 1 was obtained as 83.6 kJ mol-'. That of the other process was 38.9 kl mol-'. The colored species has been assigned as a 9-naphthoxy-l,lO-anthraquinone.

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