DiiodoBodipy-Rhodamine Dyads: Preparation and Study of the Acid-Activatable Competing Intersystem Crossing and Energy Transfer Processes

摘要: Iodo-bodipy/rhodamine dyads with cyanuric chloride linker were prepared the goal of achieving pH switching triplet excited state formation. The takes advantage acid-activated reversible cyclic lactam↔opened amide transformation rhodamine unit and fluorescence resonance energy transfer (FRET). photophysical properties studied steady-state femtosecond/nanosecond time-resolved transient absorption spectroscopies, electrochemical methods, as well TD-DFT calculations. Our results show that model dyad is an efficient generator under neutral condition, when adopts closed form. generation occurs at iodo-bodipy moiety long-lived, a lifetime 51.7 μs. In presence acid, opened form, in this case, FRET from to moiety. much faster (τFRET = 81 ps) t...