Tuning Excited-State Charge/Proton Transfer Coupled Reaction via the Dipolar Functionality

摘要: Based on design and synthesis of I, II, III, we demonstrate an ingenious approach to fine-tuning the excited-state intramolecular charge transfer (ESICT) coupled proton (ESIPT) reaction via dipolar functionality molecular framework. Both I II exhibit remarkable dual emission due different solvent-polarity environment between ESICT ESIPT states, while interplay two charge-transfer entities in III leads decoupling from effect, resulting a unique proton-transfer tautomer emission. The results make further rational ESICT/ESIPT systems feasible simply by tuning net effect. Accordingly, systematic investigation correlation regards difference vectors versus induced barriers becomes possible.