ELECTROGENERATED CHEMILUMINESCENCE FROM VIOLANTHRONE

Violanthrone, an emitter of exceptionally bright chemiluminescence. wa s examined in dimethylformamide solution to determine whether it also emits particularly bright electrogenerated chemiluminescence (ECL). Th e ECL measurements were carried out using a cycled potential which was applied to platinum electrodes. At the maximum sweep rate of 80 V s(- 1) available, the intensity of the violanthrone ECL was still increasi ng with sweep rate and was c. 56% of that from rubrene, a bright, comm only used emitter of ECL. Furthermore, assuming that the emission aris es from radical anion-cation recombination, the sweep rate dependence showed that the least stable radical ion (probably the cation) decays with a half-life shorter than 0.2 s.