Photochromism of dithiazolylethenes having pyridyl andN-methylpyridinium groups
作者:Masahiro Irie、Shizuka Takami
DOI:10.1002/poc.1204
日期:2007.11
Upon irradiation with 313 nm light the colorless acetonitrile solutions of 1a and 2a turned violet, which show the absorption maxima at 538 and 530 nm, respectively. The violet color is due to the closed-ring isomers 1b and 2b. The violet color disappeared upon irradiation with visible light (λ > 480 nm). When the pyridine rings were converted to N-methylpyridinium ions, the colorless acetonitrile solution