Photochemie substituierter Cycloheptatriene. XII. Dualfluoreszenz von 1-Aryl-4-(p-dimethylaminophenyl)-cycloheptatrienen

✍ Scribed by Dr. W. Abraham; M. Kupfer; Prof. Dr. D. Kreysig

• Book ID: 105352456
• Publisher: John Wiley and Sons
• Year: 1982
• Tongue: English
• Weight: 539 KB
• Volume: 324
• Category: Article
• ISSN: 1615-4150
• DOI: 10.1002/prac.19823240312

✦ Synopsis

Photochemistry of Substituted Cycloheptatrienes. XII. Dual Fluorescence of 1‐Aryl‐4‐(p‐dimethylaminophenyl)‐cycloheptatrienes

Diarylcycloheptatrienes 1 in solution show two fluorescences originating from two different excited states. The ratio of intensities of the two fluorescences depends on the excitation energy. Two alternatives are discussed as the origin of the dual fluorescence: conformers in the ground state or an adiabatic photoreaction, respectively. The two emissions are ascribed to different geometries of the seven‐membered ring. Despite the different excitation spectra the dual fluorescence of the compounds 1 is explained as an excited state property of a single absorbing species, and not as two ground state species giving rise to the two fluorescence bands.