Ying Zhang,* Yao-Qin Feng, Xin-Xin Tian, Jun-Hao Wang,* Honggang Li, Gaoyi Han,* and Dan Li

Abstract: Limited works are reported about off–on type mechanochromic luminogens (MLs) owing to notorious quenching effect and lacking of reliable guidance. Here a novel strategy is proposed to develop off–on type ML based on phenanthroimidazole (PI) derivative by controlling the intersystem crossing (ISC) process through variation of packing mode. This work offers a molecular level understanding of the correlations between molecular structure, stacking modes, and photophysical properties. This is the first example of PI derivative for off–on ML based on controlling ISC process.

Keywords: heavy atom effect, intersystem crossing, mechanochromic luminogens, off–on, phenanthroimidazole derivative

文章链接：adom.201800903.pdf