Mechanofluorochromism of 2-Biarylyl Cinchoninic Acids with High Sensitivity and Large Mechanochromic Shift

In recent years, organic mechanofluorochromism (MFC) materials have attracted wide attention in many fields. However, the exploration of MFC materials with high-contrast, high-sensitivity and high-responsiveness remains a challenge. Herein, a series of MFC materials with 2-biarylyl cinchoninic acid skeleton were successfully established, which are based on interconversion of classical/frustrated Bronsted pairs. These compounds have the mechanochromic shift of up to 115 nm, as well as the property of stunning sensitivity and multiple responses to external mechanical force stimuli. The luminescence properties can be easily tuned by changing the substituents.

Automated summary

In recent years, organic mechanofluorochromism (MFC) materials have gained significant attention in various fields. In this study, a series of MFC materials based on interconversion of classical/frustrated Bronsted pairs with a 2-biarylyl cinchoninic acid skeleton were successfully established. These materials exhibited remarkable features such as high contrast, sensitivity, and responsiveness to external mechanical force stimuli, and their luminescence properties could be easily adjusted by changing the substituents.