Deactivation behaviour of arenes and heteroarenes. VI. quenching of the fluorescence of heteroarenium cations at high concentrations
✍ Scribed by Jürgen Bendig; Bernd Geppert; Siegrun Helm; Dieter Kreysig
- Book ID
- 103896492
- Publisher
- Elsevier Science
- Year
- 1978
- Weight
- 498 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0378-4487
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✦ Synopsis
At high concentrations of acridizinium and N-methylacridinium salts in methanol (virtually complete dissociation) a differentiated quenching of fluorescence occurs, since a cation-cation and a cation-anion interaction exist in the excited state. The extent of the fluorescence quenching due to cation-anion interaction is determined by the donor properties of the anions and can be correlated with the corresponding ctparameters. A fluorescence quenching through cation-cation interaction in the excited state (formation of excimers) is only observed in the case of acridizinium salts. These findings are consistent with the ability of cations to cause photodimerization.