Die kinetischen Konstanten des Triplett-Zustandes von Fluoren-Molekülen / The Cinetic Constants of the Triplet Stale of Fluorene Molecules

Open Access

1 February 1972

journal article
Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung A

Vol. 27 (2) , 198-209
https://doi.org/10.1515/zna-1972-0205

Abstract

The metastable triplet state T₁ of fluorene molecules in a fluorene crystal, disturbed by the presence of dibenzothiophene (“X-traps”) was investigated at 1.6 and 4.2 °K. From ESR measurements a model for the fluoren X-traps is derived. The X-trap molecule is misoriented by an angle of 2,5° in the fluorene crystal. The rate constants for population (s), radiative decay (k^D) and total decay (k) of the three magnetic sublevels of T¹ were determined by analysis of phosphorescence intensity and decay time in high magnetic field and by optically detected ESR. We find (with z = axis perpendicular to the molecule, x = long axis): The average spin lattice relaxation rate constant is w = (0.8 ± 0.2) sec- 1 .

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