Desaktivierungsverhalten von Arenen und Heteroarenen. XI. Nachweis strahlungslos desaktivierender Excimere durch Resonanzenergietransfer

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Abstract
Deactivation Behaviour of Arenes and Heteroarenes. XI. The Evidence of Radiationless Deactivating Excimers by Resonance‐Energy TransferInvestigations of resonance‐energy transfer in the systems of anthracene‐/ and akridizinium ion/rhodamine B (BF4) show, that in the case of high concentrations of energy donors the amount of the relative fluorescence quantum yield is greater than one. This result demonstrates the existence of a further energy donor, the excimer. In the case of the N‐methyl‐acridinium ion/ rhodamine B (BF4)‐system this fact cannot be observed, therefore a formation of excimers at high concentrations should be excluded. The existence (anthracene, akridizinium ion) and non‐existence (N‐methylacridinium ion) of excimers is in agreement with the ability of forming photodimers.