The environments lead the pas de deux of ESIPT and ICT process in a fluorescent compound

This study presents a methodology for regulating the dynamic behavior of a particular excited state of a compound through the manipulation of its surrounding environment. We have developed a compound that incorporates substructures exhibiting both ESIPT and ICT capabilities. The compound allows for the modulation of either or both ESIPT and ICT processes by varying the polarity of the surrounding environment. This tuning affects the macroscopic optical characteristics, such as the morphology and wavelengths of the photoluminescence emission band, exhibiting a behavior that is infrequently documented in the literature. This study is accompanied by an extensive analysis that offers theoretical insights and innovative recommendations for the design of fluorescence materials.