Photoactive Polyoxometalate/DASA Covalent Hybrids for Photopolymerization in the Visible Range
Résumé
The synthesis of TBA-DASA-POM-DASA, the first photoactive covalent hybrid polyoxometalate (POM) incorporating a Donor-Acceptor Stenhouse Adduct (DASA) reverse photochrome, is presented. It has been evidenced that in solution the equilibrium between the colorless cyclopentenone and the highly colored triene conformers is strongly dependent not only on the nature of the solvent but also the countercations, allowing to tune its optical properties. This complex has been further associated to photochromic spironaphtoxazine cations, resulting in a material which can be activated by two distinct optical stimuli. Moreover, TBA-DASA-POM-DASA, when combined with N-methyldiethanolamine, constitutes a performing photoinitiating system for polyethylene glycol diacrylate polymerization and this under visible light irradiation, a promising result in a domain scarcely developed in POM chemistry.
Domaines
ChimieOrigine | Fichiers produits par l'(les) auteur(s) |
---|
Loading...