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International Journal of Photoenergy
Volume 7 (2005), Issue 2, Pages 103-108

Long-lived Charge-Transfer States in 9-Aryl-Acridinium Ions; A Critical Reinvestigation

1Department of Chemistry, HIMS, University of Amsterdam, Nieuwe Achtergracht 129, Amsterdam 1018 WS, The Netherlands
2Molecular Photonics Laboratory, School of Natural Sciences - Chemistry, Bedson Building, University of Newcastle, Newcastle upon Tyne NE1 7RU, United Kingdom

Copyright © 2005 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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.