title: Two-photon absorption properties of Dehydrobenzo[12]annulenes and hexakis(phenylethynyl)benzenes: effect of edge-linkage.
abstract: Two-photon absorption (TPA) properties of two trefoil-shaped compounds with different edge linkages--tris(hexadehydrotribenzo[12]annulene) and tris(tetradehydrotribenzo[12]annulene)--and three asterisk-shaped compounds having no edge-linkage--hexakis(phenylethynyl)benzenes--are investigated experimentally by the open-aperture Z-scan and TPA-induced fluorescence methods with wavelength tuneable femtosecond pulses. The compound with ethynylene edge-linkage exhibits the most intense TPA (the maximal TPA cross section is 1300+/-170 GM at 572 nm where 1 GM=10(-50) cm(4) s molecule(-1) photon(-1)). The TPA activity of the compounds is primarily explained in terms of the planarity of the molecules in relation with the type of edge-linkage.
authors.affiliation: Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan. k.kamada@aist.go.jp
authors.forename: Kenji
authors.initials: K
authors.lastname: Kamada
authors.forename: Liudmil
authors.initials: L
authors.lastname: Antonov
authors.forename: Satoru
authors.initials: S
authors.lastname: Yamada
authors.forename: Koji
authors.initials: K
authors.lastname: Ohta
authors.forename: Takashi
authors.initials: T
authors.lastname: Yoshimura
authors.forename: Kazukuni
authors.initials: K
authors.lastname: Tahara
authors.forename: Akiko
authors.initials: A
authors.lastname: Inaba
authors.forename: Motohiro
authors.initials: M
authors.lastname: Sonoda
authors.forename: Yoshito
authors.initials: Y
authors.lastname: Tobe
mesh_terms: D000480:Alkynes / Q000737:chemistry*; D001554:Benzene / Q000737:chemistry*; D001555:Benzene Derivatives / Q000737:chemistry; D002627:Chemistry, Physical / Q000379:methods*; D004563:Electrochemistry / Q000379:methods; D004581:Electronics; D006838:Hydrocarbons; D008956:Models, Chemical; D008968:Molecular Conformation; D015394:Molecular Structure; D017785:Photons; D011083:Polycyclic Compounds / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013997:Time Factors
chemical_list: D000480:Alkynes; D001555:Benzene Derivatives; D006838:Hydrocarbons; D011083:Polycyclic Compounds; C516931:dehydrobenzo(12)annulene; D001554:Benzene