H. Chi
2010
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Influential Citations
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Journal
Chemical Journal of Chinese Universities-chinese
Abstract
The synthesis of FR[2,5-dicyano-1,4-bis-(4'-fluorostyryl) benzene]with typical A-A-A conjuga-tion structure was reported,and its structure was characterized by 1H NMR,IR and elemental analysis.One-and two-photon absorption and emission properties of bis(styryl) benzene derivatives including FR and CY[2,5-dicyano-1,4-bis-(4'-cyanostyryl) benzene]with A-A-A conjugation structure,and MO[2,5-dicyano-1,4-bis-(4'-methoxystyryl) benzene] and MA[2,5-dicyano-1,4-bis-(4'-dimethylaminostyryl) benzene] with D-A-D conjugation structure were studied by the one-and two-photon-induced fluorescence emission in femto-second pulses,respectively.The maximum wavelengths of the one-photon absorption and emission increased with increasing electron-donating capacity of terminal substituent groups,and compounds FR and CY of elec-tronaccepting terminal groups displayed very high fluorescence quantum yields(0.92 and 0.89,respective-ly),long fluorescence lifetime(5.8 and 6.1 ns,respectively) and large two-photon absorption coefficient(19.1 and 20.5,respectively).The two-photon absorption cross sections(δ) of FR and CY(6350 GM and 6870 GM,respectively) with strongly electron-accepting terminal groups were much larger than those of MO and MA(270 GM and 1790 GM,respectively) with electron-donating terminal groups.The result indicates that bis(styryl) benzene derivatives with A-A-A conjugation structure exhibit a considerably large δ.