Much effort has been devoted to the generation of fluorescent probes by synthetic approaches. In this study, we developed a facile strategy to construct far-red fluorescent probes based on through-space charge transfer within complexes of acceptors and donors and their "twist + twist" interactions. Owing to their rare two-photon excitation property, the complexes could be used for in vivo imaging of the mouse cerebrovascular system.
The AEE properties of TPP-based luminogens can be modulated via the following guideline: the phenyl attachment reduces the n → π* transition component and evokes RIM, while the substituent decoration imparts altered electronic conjugation and promotes RIM.
Tetraphenylpyrazine (TPP) is a conspicuous heterocyclic fluorophore with aggregation-enhanced emission (AEE) character. In general, the TPP building block is considered as either the molecular rotor or electron acceptor in construction...
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