Trivalent Boron as an Acceptor in Donor–π–Acceptor-Type Compounds for Single- and Two-Photon Excited Fluorescence
作者:Zhi-qiang Liu、Qi Fang、Dong Wang、Du-xia Cao、Gang Xue、Wen-tao Yu、Hong Lei
DOI:10.1002/chem.200304833
日期:2003.10.17
The synthesis, structure, and fluorescence properties of a series of new donor-pi-acceptor (D-pi-A) type compounds, with a trivalent boron, protected by two mesityl groups, as acceptor, and with various typical donors and different pi-conjugated bridges, are reported. All these stable organoboron compounds show intense single-photon excited fluorescence (SPEF) and two-photon excited fluorescence (TPEF)
一系列新的供体-pi-受体(D-pi-A)型化合物的合成,结构和荧光性质,三价硼由两个均三基团保护,作为受体,并带有各种典型的供体和不同的pi报道了共轭桥。所有这些稳定的有机硼化合物在从蓝色到绿色的宽光谱范围内均显示出强烈的单光子激发荧光(SPEF)和双光子激发荧光(TPEF),SPEF的光谱峰位置与TPEF。在两种化合物的X射线晶体结构中显示出非常强的Cbond; B(mesityl)(2)键和良好共轭的pi系统,表明基态的某些电荷转移特征。同时,光谱数据表明,在激发态下,从供体到受体的电荷转移大大增强。根据典型的结构数据和全面的光谱数据,可以得出以下结构性质关系:1)中度芳基氨基供体比强烷基氨基供体能更有效地增强SPEF和TPEF强度;2)二苯乙烯具有比苯乙烯基噻吩更好的pi桥,因为它具有增强和蓝移相应D-pi-A化合物的SPEF和TPEF的能力;和3)与无硼前体和其他类似物相比,-B