不良溶剂和温度对[(TPE_(2)-BPY)_(2)-Ag]BF_(4)配合物的发光增强作用

Luminescence enhancement triggered by poor solvent and temperatures on[(TPE_(2)-BPY)_(2)-Ag]BF_(4)complex

通过引入柔性的TPE和刚性的联吡啶作为骨架,本研究设计合成L1配体,进而与AgBF4反应并在二氯甲烷/正己烷体系中扩散得到化合物[(TPE_(2)-BPY)_(2)-Ag]BF_(4)的晶体.通过电喷雾质谱、单晶数据分析确定了化合物的配位形式;通过紫外-可见吸收光谱、激发发射光谱以及寿命研究了其光学性质;更近一步地研究其对不良溶剂和温度(298 K,77 K)依赖的光物理行为.结果表明,[(TPE_(2)-BPY)_(2)-Ag]BF_(4)是一种AIPE活性配合物,通过3ILCT利用TPE2-BPY的AIE活性,增加不良溶剂的含量或降低测试温度会诱导荧光增强,且该化合物的荧光发射强度在不良溶剂正己烷含量为95%时达到最大.

L1 ligand was designed and synthesized by introducing flexible part TPE and rigid part bipyridine as skeleton.Compounds[(TPE_(2)-BPY)_(2)-Ag]BF_(4)were synthesized by reaction with AgBF4,and crystals were obtained by diffusion in dichloromethane-n-hexane system.In this paper,the coordination form of the compound was determined by electrospray ionization mass spectrometry and single crystal data analysis;the optical properties were studied by UV-vis absorption spectrum,excitation emission spectrum and lifetime;furthermore,the photophysical behavior of the solvent and temperature dependent(298 K,77 K)was studied.The results showed that[(TPE_(2)-BPY)_(2)-Ag]BF_(4),an AIPE(aggregation-induced phosphorescence enhancement)-active complex beneficial from the AIE(aggregation-induced emission)-activity of TPE2-BPY through(3)^ILCT,induced a luminescence enhancement by increasing the contents of poor solvent or decreasing the test temperatures.The fluorescence emission intensity of the compound reached the maximum when the content of n-hexane was 95%.