硅烷桥联四苯乙烯-寡聚噻吩衍生物的结构与光谱性质

Structure and Photophysical Properties of Silane Bridged Tetraphenylethylene-Oligothiophene Derivatives

设计合成了一系列硅烷桥联四苯乙烯(TPE)-寡聚噻吩衍生物.硅烷取代基为甲基和苯基,寡聚噻吩单元中噻吩数量为1~3,通过空间位阻效应和电子效应调控分子的固态发光性质.具有苯基取代基的硅烷和二噻吩分子表现出高达64.5%的固态发光.含1或2个噻吩单元的分子的固态和液态荧光性质类似四苯乙烯,而含3个噻吩的分子的发光则主要来自于三噻吩,其在液态和聚集态分别有1.4%和14%的发光效率.苯基硅烷桥联三噻吩-四苯乙烯分子的聚集体具有检测硝基爆炸物的能力和防伪应用潜力.

A series of silane-bridged tetraphenylethene(TPE)-oligothiophene derivatives were synthesized.The silane substituents varied from methyl to phenyl groups,while the number of thiophene units in the oligothiophene segment was 1 to 3.The solid-state luminescence properties of the molecules were regulated by steric hindrance and electronic effects.Phenyl substituted silane-bridged bithiophene(BT)-TPE molecules exhibited up to 64.5%solid-state luminescence.Molecules containing 1 or 2 thiophene units exhibited fluorescence properties similar to TPE in both solid and liquid states,while the emission of molecules containing 3 thiophene units mainly came from terthiophene(TT)with luminescence efficiencies of 1.4%and 14%in liquid and aggregated states,respectively.The aggregate of phenyl substituted silane-bridged TT-TPE molecules exhibited potential for detecting nitro explosives and anti-counterfeiting applications.