Long-lived Charge-Transfer States in 9-Aryl-Acridinium Ions; A Critical Reinvestigation
2005
Jan W. Verhoeven | Hendrik J. van Ramesdonk | Hong Zhang | Michiel M. Groeneveld | Andrew C. Benniston | Anthony Harriman
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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