Titre :

Cisoid-cis intermediate plays a crucial role in decolouration rate in photochromic reaction of 8H-pyranoquinazolines and 3H-naphthopyrans

Auteur(s) :

Brazevic, S. [Auteur]
Sikorski, M. [Auteur]
Sliwa, Michel [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Abe, J. [Auteur]
Rode, M. F. [Auteur]
Burdzinski, G. [Auteur]

Titre de la revue :

Dyes and Pigments

Nom court de la revue :

Dyes Pigment.

Numéro :

201

Pagination :

-

Date de publication :

2022-11-13

ISSN :

0143-7208

Mot(s)-clé(s) en anglais :

Time-resolved spectroscopy
Ab initio calculations
Colour fading mechanism
Photochromism
3H-naphthopyrans
8H-pyranoquinazolines

Discipline(s) HAL :

Chimie/Chimie théorique et/ou physique

Résumé en anglais : [en]

The photochromic reaction of 8H-pyranoquinazoline shows intriguing aspects in comparison to 3H-naphthopyrans. These come from a stabilized excited singlet state for 8 H-pyranoquinazoline, which has a longer lifetime and ...
Lire la suite >The photochromic reaction of 8H-pyranoquinazoline shows intriguing aspects in comparison to 3H-naphthopyrans. These come from a stabilized excited singlet state for 8 H-pyranoquinazoline, which has a longer lifetime and is strongly sensitive to the solvent. The polar solvent acetonitrile reduces the quantum yield of coloured isomer formation (transoid-cis species). Colour fading related to the decay of transoid-cis population is faster than that for 3H-naphthopyran family and occurs within few seconds time-window in solution at room temperature. Theoretical calculations show the crucial role in fading process played by the potential energy landscape, with the cisoid-cis intermediate located in a shallow high-energy minimum.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS

Collections :

• Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516

Date de dépôt :

2024-02-28T23:45:28Z
2024-03-20T08:14:58Z