Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 18, Issue 21, Pages 6568-6575Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201103896
Keywords
acidity; diarylethenes; dyes; pigments; isomers; photochromism
Categories
Ask authors/readers for more resources
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 1H 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 pKa 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available