Display options
Cite
Benniston AC, Harriman A, Li P, et al. Charge shift and triplet state formation in the 9-mesityl-10-methylacridinium cation. J Am Chem Soc. 2005;127(46):16054-64doi: 10.1021/ja052967e.
Benniston, A. C., Harriman, A., Li, P., Rostron, J. P., van Ramesdonk, H. J., Groeneveld, M. M., Zhang, H., & Verhoeven, J. W. (2005). Charge shift and triplet state formation in the 9-mesityl-10-methylacridinium cation. Journal of the American Chemical Society, 127(46), 16054-64. https://doi.org/10.1021/ja052967e
Benniston, Andrew C, et al. "Charge shift and triplet state formation in the 9-mesityl-10-methylacridinium cation." Journal of the American Chemical Society vol. 127,46 (2005): 16054-64. doi: https://doi.org/10.1021/ja052967e
Benniston AC, Harriman A, Li P, Rostron JP, van Ramesdonk HJ, Groeneveld MM, Zhang H, Verhoeven JW. Charge shift and triplet state formation in the 9-mesityl-10-methylacridinium cation. J Am Chem Soc. 2005 Nov 23;127(46):16054-64. doi: 10.1021/ja052967e. PMID: 16287292.
Copy Download .nbib Format: NLM
Share it on

J Am Chem Soc. 2005 Nov 23;127(46):16054-64. doi: 10.1021/ja052967e.

Charge shift and triplet state formation in the 9-mesityl-10-methylacridinium cation.

Journal of the American Chemical Society

Andrew C Benniston, Anthony Harriman, Peiyi Li, James P Rostron, Hendrik J van Ramesdonk, Michiel M Groeneveld, Hong Zhang, Jan W Verhoeven

Affiliations

  1. Molecular Photonics Laboratory, School of Natural Science, University of Newcastle, Newcastle upon Tyne, NE1 7RU, United Kingdom.

PMID: 16287292 DOI: 10.1021/ja052967e

Abstract

The target donor-acceptor compound forms an acridinium-like, locally excited (LE) singlet state on illumination with blue or near-UV light. This LE state undergoes rapid charge transfer from the acridinium ion to the orthogonally sited mesityl group in polar solution. The resultant charge-transfer (CT) state fluoresces in modest yield and decays on the nanosecond time scale. The LE and CT states reside in thermal equilibrium at ambient temperature; decay of both states is weakly activated in fluid solution, but decay of the CT state is activationless in a glassy matrix. Analysis of the fluorescence spectrum allows precise location of the relevant energy levels. Intersystem crossing competes with radiative and nonradiative decay of the CT state such that an acridinium-like, locally excited triplet state is formed in both fluid solution and a glassy matrix. Phosphorescence spectra position the triplet energy well below that of the CT state. The triplet decays via first-order kinetics with a lifetime of ca. 30 micros at room temperature in the absence of oxygen but survives for ca. 5 ms in an ethanol glass at 77 K. The quantum yield for formation of the LE triplet state is 0.38 but increases by a factor of 2.3-fold in the presence of iodomethane. The triplet reacts with molecular oxygen to produce singlet molecular oxygen in high quantum yield. In sharp contradiction to a recent literature report, there is no spectroscopic evidence to indicate the presence of an unusually long-lived CT state.

Publication Types