Die Photochemie von Diazo-dibenzoylmethan Eine wellenlängen- und temperaturabhängige Photoreaktion
✍ Scribed by N. Baumann
- Publisher
- John Wiley and Sons
- Year
- 1972
- Tongue
- German
- Weight
- 460 KB
- Volume
- 55
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
Diazo‐dibenzoylmethane I undergoes two primary photochemical processes leading to α‐phenyl‐α‐benzoyl‐methane II and dibenzoylmethane III. The formation of II is related to the lowest excited singlet state of I and the formation of III is related to the lowest excited triplet state of I. The quantum yields of both processes (Φ~II~, Φ~III~) are strongly wavelength dependent. It is unambiguously demonstrated, that the population of the two excited states depends on the energy of the exciting light, thus causing a wavelength effect. There is shown to be an activation barrier controlling the rate of intersystem crossing from the S~1~ to the T~1~ level of I.