4,4′-Diaminostilbene (DAS), its monoprotonated and diprotonated forms exhibit fluorescence. Their UV absorption and fluorescence emission spectra in different solvents and proton concentrations have been measured. 4-Trimethylammonium-4′-aminostibene hydrogen sulfate has been synthesized as a model for the monoprotonated DAS form. pKa values in the ground state have been measured spectrophotometrically. The Stokes shifts in solvents of different polarities, the quantum yields and the apparent rate constants of trans-cis isomerization have been determined. Solvent polarity has a strong influence on spectroscopic properties.
|Number of pages||6|
|Journal||Journal of Photochemistry and Photobiology A: Chemistry|
|State||Published - 13 Sep 1996|
- 4-Trimethylammonium-4′-aminostilbene hydrogen sulfate
- Molecular probe