期刊
DYES AND PIGMENTS
卷 160, 期 -, 页码 915-922出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2018.09.014
关键词
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资金
- Agence Nationale de la Recherche (ANR project GeDeMi)
- SATT Conectus (Dualem maturation project)
- Centre National de la Recherche Scientifique (CNRS)
Excited-State Intramolecular Proton Transfer (ESIPT) emitters based on a 2-(2'-hydroxyphenyl)benzazole (HBX) scaffold, incorporating triethyl- or triphenylsilyl substituents either at the 3',5' positions of the benzoxazole ring or at the 3,5 positions of the phenol cycle have been synthesized through an expedite two-steps synthetic route. Upon excitation and depending on the substitution and environment, these fluorophores display either single (keto) or dual (enol/keto) fluorescence emission spanning from 400 to 570 nm. Unlike the majority of reported ESIPT emitters, these rigidified dyes display intense fluorescence intensity in the solution-state in either aprotic apolar (toluene) or protic polar (ethanol) solvents with observed emission quantum yields (QY) up to 52% and 44%, respectively. These values represent a drastic enhancement as compared to unsubstituted HBX dyes which feature QY between 1 and 2% in toluene. These fluorophores remain highly emissive in the solid-state, as dispersed in KBr pellets or doped in PMMA films (QY up to 77% and 60% respectively). Molecular engineering studies showed that it is possible to fine-tune the emission color with very small modifications of the HBX scaffold. The nature of the excited-states was also probed through ab initio calculations, evidencing in each case a transition from the K* state.
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