摘要
Two tribranched chromophores,1,3,5-triazine as electron deficient core,9,9-dimethylfluorene asπ-conjugated bridge, diphenylamino（4a） and naphthylamino（4b） as electron-donating end-groups,were successfully prepared via Buchwald-Hartwig coupling reaction.Their linear photophysical and two-photon absorption（TPA） properties were investigated by absorption, fluorescence and nonlinear transmission method,respectively.The absorption cut-offs of the chromophores are below 550 nm and both chromophores have strong fluorescence emission.The compound 4a（206.3 GM） exhibits larger TPA cross-section than 4b （57.8 GM） in the femtosecond regime at 800 nm.
Two tribranched chromophores,1,3,5-triazine as electron deficient core,9,9-dimethylfluorene asπ-conjugated bridge, diphenylamino（4a） and naphthylamino（4b） as electron-donating end-groups,were successfully prepared via Buchwald-Hartwig coupling reaction.Their linear photophysical and two-photon absorption（TPA） properties were investigated by absorption, fluorescence and nonlinear transmission method,respectively.The absorption cut-offs of the chromophores are below 550 nm and both chromophores have strong fluorescence emission.The compound 4a（206.3 GM） exhibits larger TPA cross-section than 4b （57.8 GM） in the femtosecond regime at 800 nm.
基金
supported financially by National Natural Science Foundation of China(Nos.20774039 and 20872061)
the National Basic Research(No.2007CB925103)
