Bulletin of the Chemical Society of Japan p. 794 - 796 (1987)
Update date:2022-08-11
Topics:
Kamogawa, Hiroyoshi
Suzuki, Tsuyoshi
Some viologen crystals bearing a p-toluenesulfonate anion as a counter ion were shown to exhibit reversible photoreductions (photochromism) either in air or under vacuum, whereas in a poly(N-vinyl-2-pyrrolidone) matrix all investigated viologens indicated reversible photocolor developments.Amphoteric ions such as 1,1'-bis(3-sulfonatopropyl)-4,4'-bipyridinium also developed colors with high stabilities.
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