中文摘要：

采用非线性透过率法研究了以N为耦合中心的多枝化合物N-[4-{2-（3,5-二-[5-（4-叔丁基苯基）-1,3,4-噁二唑-2-]苯基}-1-乙烯基}苯基}-N,N-二苯胺（BPODPA）,N,N-双[4-{2-（3,5-二-[5-（4-叔丁基苯基）-1,3,4-噁二唑-2-]苯基}-1-乙烯基}苯基}-N-苯胺（BBPOPA）和N,N,N-三[4-{2-（3,5-二-[5-（4-叔丁基苯基）-1,3,4-噁二唑-2-]苯基}-1-乙烯基}苯基}胺（TBPOA）的双光子吸收性质,测定了化合物的单光子荧光光谱和双光子上转换荧光光谱,研究了多枝化对三苯胺分子双光子吸收和双光子激发荧光性质的影响.在800nm波长的激光激发下,化合物BPODPA、BBPOPA和TBPOA在二氯甲烷溶液中发出很强的蓝绿色双光子上转换荧光,荧光峰分别位于502、515和518nm.这些多枝结构化合物的双光子吸收截面较大,双光子吸收增强来源于多枝分子中扩展的π共轭体系和重复单元的协同效应.

英文摘要：

Two-photon absorption （TPA） properties of multibranch chromophores with nitrogen coupling center, N-J4- { 2-（3,5-di- { 5-[4-（tert-butyl）phenyl]-1,3,4-oxadiazol-2-yl }phenyl）-1-ethenyl }phenyl]-N,N-diphenylamine （BPODPA）, N,N-bis [4-{2-（3,5-di-{5-[4-（tert-butyl）phenyl]-1,3,4-oxadiazol-2-yl}phenyl）-1-ethenyl}phenyl]-N-phenylamine （BBPOPA） and N,N,N-tris[4-{2-（3,5-di-{5-[4-（tert-butyl）phenyl]-1,3,4-oxadiazol-2-yl}phenyl）-1-ethenyl}phenyl] amine （TBPOA）, were measured by nonlinear transmission method. Single photon excited fluorescence and two-photon excited fluorescence （TPEF） of the chromophores were studied. The effect of dendronization on the TPA and TPEF characters of triphenylamine-based chromophores was investigated. When pumped with 800 nm laser irradiation, chromophores BPODPA, BBPOPA, and TBPOA showed strong two-photon excited blue green fluorescence at 502, 515, and 518 nm, respectively. These multibranched chromophores showed large TPA cross-section. The enhanced two-photon absorption found in these chromophores was attributed to the fact that the multibranched chromophores had both an extended It-conjugated system and an increased intramolecular cooperative effect compared to the one-branched chromophore.