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Raman spectroscopic study of photochromic N-[4-(4-n-alkoxybenzoyloxy)-2-hydroxybenzylidene]chloroanilines

✍ Scribed by Akira Takase; Toshiaki Koga; Kazuhiro Nonaka; Sakumitsu Sakagami

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 137 KB
Volume: 30
Category: Article
ISSN: 0377-0486
DOI: 10.1002/(sici)1097-4555(199912)30:12<1073::aid-jrs487>3.0.co;2-0

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✦ Synopsis

N -[4-(4-n-Alkoxybenzoyloxy)-2-hydroxybenzylidene]chloroanilines [nAHmCl (n = 1-8; m = 2, -ortho; m = 3, -meta; m = 4, -para)] were newly synthesized. Some of them exhibited a photochromic color state on ultraviolet irradiation. In 1AH2Cl, the fresh solid species as prepared by crystallization from ethanol solution was highly photochromic, more so than any of the other compounds studied. The solid species derived from the melt was hardly photochromic but was thermochromic. The species became photochromic on annealing at about 100 • C. The annealed species exhibited both photochromism and thermochromism. Through the measurement of Raman spectra, the behavior was explained by the change in the twist angle of the aniline ring to the salicylaldimino part of the molecule. It was found that the band at 999 cm -1 ascribed to the CH out-of-plane vibration of the aniline ring is a reliable indication of the photochromic form's identity.

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