In the recent literature a simple 9‐aryl‐acridinium ion was claimed to undergo an intramolecular, photoinduced charge shift to produce an extremely long‐lived and very high energy charge‐transfer state. The possible consequences of this observation are discussed and the tenability of the claims made is investigated via time resolved spectroscopy of a closely related system with spectroscopic characteristics allowing more solid identification of the actual photophysical events taking place. From the results obtained it appears likely that the long‐lived species observed earlier in solution cannot be charge transfer in nature but must instead be identified as the lowest triplet state of the acridinium chromophore.
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Verhoeven et al. (2005) studied this question.