Solution and solid-state Excited-State Intramolecular Proton Transfer (ESIPT) emitters incorporating Bis-triethyl-or triphenylsilylethynyl units - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Dyes and Pigments Année : 2019

Solution and solid-state Excited-State Intramolecular Proton Transfer (ESIPT) emitters incorporating Bis-triethyl-or triphenylsilylethynyl units

Résumé

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.

Domaines

Chimie
Fichier non déposé

Dates et versions

hal-02140872 , version 1 (27-05-2019)

Identifiants

Citer

Julien Massue, Abdellah Felouat, Mathieu Curtil, Pauline M. Verite, Denis Jacquemin, et al.. Solution and solid-state Excited-State Intramolecular Proton Transfer (ESIPT) emitters incorporating Bis-triethyl-or triphenylsilylethynyl units. Dyes and Pigments, 2019, 160, pp.915-922. ⟨10.1016/j.dyepig.2018.09.014⟩. ⟨hal-02140872⟩
59 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More