| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 26591 | Journal of Photochemistry and Photobiology A: Chemistry | 2015 | 7 Pages |
•Fluorescence of two carbonyl-twisted PRODAN derivatives is studied.•Fluorescence in toluene-alcohol solvents is fit with preferential solvation models.•Strong quenching behavior with methanol and ethanol involves two H-bonds.•Quenching shows an energy-gap dependence.
The fluorescence behavior of 3-(dimethylamino)-8,9,10,11-tetrahydro-7H-cyclohepta[α]naphthalen-7-one and 1-(6-(dimethylamino) naphthalen-2-yl)-2,2-dimethylpropan-1-one, both carbonyl-twisted derivatives of PRODAN, in binary mixtures of toluene and an alkanol (methanol, ethanol isopropanol) is fit to a three-step preferential solvation model. The photophysical parameters extracted from the model include the solvatochromic shifts resulting from a single H-bond and the quenching that is due to changes in polarity only. The results confirm that quenching involves two H-bonds. They also show that the H-bond-induced quenching shows an energy-gap dependence.
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