title: Two-photon absorption properties of heterafluorenes and spirobiheterafluorenes bearing aminostyryl arms.
abstract: A phosphoniafluorene and a spirobiphosphoniafluorene bearing 4-(diethylamino)styryl groups were synthesized. These compounds exhibited bathochromically shifted absorption and emission, compared with their silicon analogues, because of the strong acceptor property of the phosphonium core. They also showed enhanced two-photon absorptions at around 930 nm.
authors.affiliation: Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Agou
authors.forename: Md Delwar
authors.initials: MD
authors.lastname: Hossain
authors.forename: Takayuki
authors.initials: T
authors.lastname: Kawashima
authors.forename: Kenji
authors.initials: K
authors.lastname: Kamada
authors.forename: Koji
authors.initials: K
authors.lastname: Ohta
mesh_terms: D000042:Absorption; D005449:Fluorenes / Q000737:chemistry*; D017785:Photons; D013057:Spectrum Analysis; D013141:Spiro Compounds / Q000737:chemistry; D013343:Styrenes / Q000737:chemistry
chemical_list: D005449:Fluorenes; D013141:Spiro Compounds; D013343:Styrenes