Photochromism of a Methyl Viologen Bismuth(III) Chloride: Structural Variation Before and After UV Irradiation

Xu, Gang; Guo, Guo‐Cong; Wang, Ming‐Sheng; Zhang, Zhang‐Jing; Chen, Wen‐Tong; Huang, Jin‐Shun

doi:10.1002/anie.200700122

Photochromism of a Methyl Viologen Bismuth(III) Chloride: Structural Variation Before and After UV Irradiation

Color scheme: Reversibly photochromic crystals of (MV)Bi2Cl8 (methyl viologen, MV2+: N,N′-dimethyl-4,4′-bipyridinium) show structural variations before and after UV irradiation. Color reversion is accomplished by heating in air (see picture). ([Bi2Cl8]2−)∞ double-octahedral chains serve as electr…