Gated photochromism and acidity photomodulation of a diacid dithienylethene dye |
| |
Authors: | Massaad Julie Micheau Jean-Claude Coudret Christophe Sanchez Rafael Guirado Gonzalo Delbaere Stéphanie |
| |
Institution: | University Paul Sabatier, UMR CNRS 5623, IMRCP, 31062 Toulouse, France. |
| |
Abstract: | The present study quantitatively analyses the gated photochromism and the acidity photomodulation properties of a diacid dithienylethene compound. Photoisomerisation between the open and closed isomers was investigated by UV/visible and (1)H NMR spectroscopy. It was found that the photocyclisation quantum yield of the diacid form was remarkably high (around 90%). Partial neutralisation of the open isomer revealed a gated photochromism as the photocyclisation quantum yield of the mono- and dianion were 50 and 67%, respectively. A considerable photomodulation of the acidity was observed: the closed isomer is more acid than the open one by more than one pK(a) unit. This effect has been shown to be exploitable for a reversible photo-acid generation. This is the first time that a complete quantitative investigation that allows for the determination of the main photochromic, spectral and thermodynamic parameters of a base-sensitive photochromic diarylethene has been carried out. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|