Abstract
Fluorene crystals, doped with phenazine or with acridine, show in the ESR spectrum of their optically excited metastable triplet state besides the isolated molecules on anomalous additional spectrum. This additional triplet ESR spectrum requires besides the optical excitation a thermal activation. It is only observed at temperatures above 200 K. The zero field splitting of this additional triplet is about 1 6 of the zero field splitting of the isolated molecules. This is exceptionally small as compared to other aromatic systems. It is suggested that this spectrum is due to host guest heteroexcimers.
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