title: Photoinduced ground-state singlet biradical--novel insight into the photochromic compounds of biindenylidenediones.
abstract: The biindenylidenedione derivative (A) developed a biradical accompanied by the simultaneous photocolor development on UV or sunlight irradiation; the former of which showed antiferromagnetic behavior on account of the singlet ground state and a thermally accessible triplet state.
authors.affiliation: Department of Chemistry, Nankai University, Tianjin 300071, P.R. China.
authors.forename: Lili
authors.initials: L
authors.lastname: Xu
authors.forename: Teruki
authors.initials: T
authors.lastname: Sugiyama
authors.forename: Huaming
authors.initials: H
authors.lastname: Huang
authors.forename: Zhiji
authors.initials: Z
authors.lastname: Song
authors.forename: Jiben
authors.initials: J
authors.lastname: Meng
authors.forename: Teruo
authors.initials: T
authors.lastname: Matsuura