A novel structure for ESIPT emission: Experimental and theoretical investigations

Theoretical investigations on forward–backward ESIPT processes of three fluorophores deriving from 2-(2′-hydroxyphenyl)thiazole

“…In recent years, researchers proposed that the types of proton donor and proton acceptor could promote or hinder ESIPT process [29,[44][45][46][47][48]. Among ESIPT active molecules, phenols and naphthols are common photoacids since they have much lower acid dissociation constants in the excited state than that in the ground state (pK a * < pK a ) [49].…”

An ESIPT-ICT steered naphthylthioic-based ionic probe with dual emissive channels exhibiting CHEF and CHEQ effects

“…Hydrogen-bonding based intramolecular charge transfer mechanism, with basicity characteristics such as AcO − are mostly associated with the deprotonation process of the molecule (M), when analytes are in excess. 75 Thus, the dual emission characteristics of M in both cases was ascribed to the hydrogen bonding process and the gradual deprotonation action, which eventually lead to the formation of an enol–keto tautomeric forms ( Scheme 5 ). The titration profile ( Fig.…”

Regulation of conjugate rigid plane structures for achieving transformation of fluorescence recognition properties

“…Bisbenzimidazole ring is a simple and stable conjugate structure, which can emit fluorescence with a large Stokes shift and high fluorescence quantum yield through excited-state intermolecular proton transfer in molecules 1–4 (ESIPT). Therefore, it is an important heterocyclic motif in organic synthesis and has many potential applications in the research field, such as tunable luminescence, 5,6 anticancer properties, 7 crystal engineering, 8–10 the recovery of heavy metals from aqueous solutions 11 and volatile organic compounds 12 (VOCs).…”