Enhanced photoreactivity of acenaphthylene in water: a product and mechanism study
| Autor: | Reza Dabestani, Eric L. Burch, Michael E. Sigman, Ashley Brown, John T. Barbas, Eddie A. Chevis |
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| Rok vydání: | 1996 |
| Předmět: |
chemistry.chemical_classification
Reaction mechanism Aqueous solution General Chemical Engineering Dimer Photodissociation General Physics and Astronomy General Chemistry Photochemistry Acenaphthylene chemistry.chemical_compound Polycyclic compound chemistry Reactivity (chemistry) Cis–trans isomerism |
| Zdroj: | Journal of Photochemistry and Photobiology A: Chemistry. 94:149-155 |
| ISSN: | 1010-6030 |
| DOI: | 10.1016/1010-6030(95)04099-4 |
| Popis: | Acenaphthylene undergoes direct photolysis in dilute aqueous solutions at concentrations as low as 5 × 10 −7 M. The reactivity observed for acenaphthylene in water greatly exceeds that observed in organic solvents. The major products from direct photolysis in aerated aqueous solutions at concentrations above 5 × 10 −5 M are the cis and trans dimers of acenaphthylene. Triplet-sensitized dimerization in water produces a large excess of cis dimer (cis/trans = 14); however, direct photolysis initially produces a small excess of cis dimer (cis/trans = 1.5) and upon further conversion the ratio changes to favor the trans dimer (cis/trans = 0.6). The origin of the trans dimer is assigned to photolysis of crystalline acenaphthylene which is though to form as a coprecipitate with cis dimer during photolysis. The origin of the cis dimer is assigned to dimerization from the triplet manifold. The increased efficiency of acenaphthylene photolysis is attributed to a hydrophobic effect and partly to an enhanced efficiency of dimerization in crystalline acenaphthylene. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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