Effect of π-conjugated linkage on photophysical properties: Acetylene linker as the better connection group for highly solvatochromic probes
作者:Alexis Tigreros、Alejandro Ortiz、Braulio Insuasty
DOI:10.1016/j.dyepig.2014.05.035
日期:2014.12
synthetized and the effects of π-conjugated linkers (vinyl, ethynyl and 1,3-diynyl) on the solvatochromic properties were studied. The fluorescence emission spectra of the dyes were studied using solvents of different polarities, and the influence of specific solvent–solute interactions over emission properties was investigated through Lippert–Mataga model. In particular, we found that compound 2 (with an ethynyl
基于在三苯基胺和芴(荧光团1 - 3)中synthetized和研究了溶剂化性质的π共轭连接基(乙烯基,乙炔基和1,3-二炔基)的影响。使用不同极性的溶剂研究了染料的荧光发射光谱,并通过Lippert-Mataga模型研究了特定的溶剂-溶质相互作用对发射性能的影响。特别是,我们发现化合物2(具有乙炔基)相对于分别具有乙烯基和1,3-二炔基的化合物1和3表现出显着的优势。它显示出更好的溶剂致变色性(从己烷到CH 3 CN为140 nm ),更高的斯托克斯位移(CH为178 nm)3 CN)和朝向极性溶剂更敏感的量子产率(0.09 DMF -0.98 THF)中,当与那些所述参考探针(普罗丹)进行比较。此外,在相同条件下,该接头表现出更高的抗光脱盐性。通过DFT和TD-DFT对几何和电子跃迁进行了分析,其结果与实验结果相吻合。