Exciton self-trapping in tetrafluoro-dimethyl-aminoacridine single crystals

Tavazzi, S., Miozzo, L., Papagni, A., Raimondo, L., Silvestri, L., Spearman, P., Camposeo, A., Polo, M. and Pisignano, D. (2007) Exciton self-trapping in tetrafluoro-dimethyl-aminoacridine single crystals. The Journal of Chemical Physics, 126(23), p. 234501. ISSN (print) 0021-9606

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The UV-visible optical spectra of 1,2,3,4-tetrafluoro-7-(N,N)dimethyl-amino-acridine single crystals are reported. The results are discussed on the basis of the molecular transitions and crystal packing in the framework of the theory of molecular excitons under a fluctuating potential field due to dynamic disorder. A strong local geometry distortion is demonstrated by applying the Urbach rule to the absorption tails, which is the amplitude of the local potential fluctuation being larger than the intermolecular transfer energy. The lineshape and linewidth of the emission band and its temperature dependence give further evidence of exciton self-trapping.

Item Type: Article
Additional Information: Article no: 234501 Article was also included in review issue Virtual Journal of Biological Physics Research, 15 June 2007.
Uncontrolled Keywords: state emitting systems, molecular-crystals, optical-properties, Urbach rule
Research Area: Chemistry
Faculty, School or Research Centre: Faculty of Science (until 2011)
Related URLs:
Depositing User: Katrina Clifford
Date Deposited: 24 Nov 2009 13:23
Last Modified: 31 Jan 2012 10:23
DOI: https://doi.org/10.1063/1.2735622
URI: http://eprints.kingston.ac.uk/id/eprint/6017

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