Title :

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

Author(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]

Journal title :

Dyes and Pigments

Abbreviated title :

Dyes Pigment.

Volume number :

201

Pages :

-

Publication date :

2022-11-13

ISSN :

0143-7208

English keyword(s) :

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

HAL domain(s) :

Chimie/Chimie théorique et/ou physique

English abstract : [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 ...
Show more >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.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS

Collections :

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

Submission date :

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