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Two‐Photon Absorption Properties of Dehydrobenzo[12]annulenes and Hexakis(phenylethynyl)benzenes: Effect of Edge‐Linkage |
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| Authors: | Kenji Kamada Dr Liudmil Antonov Prof Satoru Yamada Dr Koji Ohta Dr Takashi Yoshimura Kazukuni Tahara Prof Akiko Inaba Motohiro Sonoda Prof Yoshito Tobe Prof |
| Institution: | 1. Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563‐8577, Japan, Fax: (+81) 72‐751‐9637;2. Institute of Organic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev str. bl. 9, Sofia 1113, Bulgaria;3. Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560‐0043, Japan;4. Division of Frontier Materials Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560‐8531, Japan |
| Abstract: | Two‐photon absorption (TPA) properties of two trefoil‐shaped compounds with different edge linkages—tris(hexadehydrotribenzo12]annulene) and tris(tetradehydrotribenzo12]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 cm4 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. |
| Keywords: | aromatic compound electronic coupling fluorescence hydrocarbons two‐photon absorption |