title: Dimethyl 2-(4-bromophenyl)-10,11-dimethoxy-2,3,7,8-tetrahydrospiro[azepino[2,1-a]isoquinoline-3,9'-fluorene]-4,5-dicarboxylate.
abstract: The title compound, C38H32BrNO6, is a new photochromic tetrahydroazepinoisoquinoline (THAI). The longest spiro bond [1.589 (4) A] can be broken very easily by UV light, leading to ring opening. This explains the photochromic behaviour.
authors.affiliation: Department of Chemistry, Fudan University, Shanghai 200433, People's Republic of China.
authors.forename: Li
authors.initials: L
authors.lastname: Feng
authors.forename: Zhi-Ming
authors.initials: ZM
authors.lastname: Li
authors.forename: Zhen-Xia
authors.initials: ZX
authors.lastname: Chen
authors.forename: Yong-Sheng
authors.initials: YS
authors.lastname: Tan
authors.forename: Lin-Hong
authors.initials: LH
authors.lastname: Weng
authors.forename: Feng-Gang
authors.initials: FG
authors.lastname: Tao