| Autor: |
Paul de Mayo, H. Al-Ekabi |
| Rok vydání: |
1986 |
| Předmět: |
|
| Zdroj: |
Tetrahedron. 42:6277-6284 |
| ISSN: |
0040-4020 |
| DOI: |
10.1016/s0040-4020(01)88090-x |
| Popis: |
The CdS dispersion mediated photoinduccd dimerization of N-vinylcarbazole (NVC) has been investigated and found to be efficient. The rate of reaction is not affected over quite a wide range of CdS masses at constant NVC concentration in solution. The reaction requires the presence of oxygen. At low light intensities the rate is linearly related thereto. A cation radical mechanism is proposed since the reaction can be efficiently quenched by electron donors. The dimerization appears to follow the Langmuir-Hinshelwood and modified Eley-Rideal mechanisms, as does the quenching. CdS of different origins with different surface areas, purities and structures were used and the rates varied by a factor of four. None of these functions appears to play a dominant role in the rate of dimerization. The variation in rates and in activation energies suggested the importance of traps located close to the conduction band. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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