Cocrystal engineering: Tuning the charge transfer excitons for highly sensitive luminescent switching materials under multiple stimuli

This paper presents a multi-stimuli responsive cocrystal system with luminescent properties that can be dynamically controlled and demonstrates the mechanism of cocrystals under multiple stimuli (acid/alkali vapor, force, heat). Detailed spectroscopic, computational, structural studies exhibit obvious charge transfer interactions occur in loosely mixed-stacking cocrystals. Such weakened by acid vapor fuming due to strong electron-withdrawing effect cations strengthened mechanical grinding. Furthermore, response time is order seconds, which much superior those most previously reported stimuli-responsive Accordingly, high-sensitive fluorescence switching demonstrated stimuli, providing an effective strategy develop smart materials.