Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
177717 | Dyes and Pigments | 2008 | 7 Pages |
Abstract
A liquid/liquid interfacial technique was used to prepare biscoumarin dyes by condensing 7-hydroxy-4-methylcoumarin with various diacyl chlorides in the presence of a phase-transfer catalyst such as triethylbenzylammonium chloride. The reaction conditions were optimized. Six new biscoumarin derivatives were thus prepared in high yield. Their optical properties were studied in chloroform by UV/vis absorption and fluorescence spectroscopies. It appeared that the shape of the absorption spectra varies with the nature of the tether between both chromophores. In contrast, the excitation and emission spectra were almost unchanged, although the compounds exhibited drastic differences in their fluorescence efficiency.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Houcine Ammar, Souhir Abid, Suzanne Fery-Forgues,