Jw. Zhou et al., PHOTOINDUCED DIMER FORMATION OF THE INCLUSION COMPLEXES OF AN INDOLINE SPIROPYRAN WITH CYCLODEXTRINS, Chemistry Letters, (7), 1998, pp. 667-668
The photoinduced coloured form(B) of inclusion complex formed between
a long-chain photochromic spiropyran and alpha-, beta- or gamma-cyclod
extrins can assemble into dimer (B-2), which can in turn stabilize the
coloured form.