PHOSPHORESCENCE STUDIES OF NON-HEXAGONAL BENZENE.

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1965, 1965

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Ohio State University

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Recent ESR studies by de Groot and van der Waals1 have indicated that benzene in its lowest triplet state does not possess hexagonal symmetry. These findings are confirmed by spectroscopic studies of the phosphorescence of various deuterated benzenes. The phosphorescence spectrum of C6H5D or pC6H4D2 dissolved in C6D6 at 4.2K arises from two isomers while that of C6H6 or sym-C6H2D3 arises from only one isomer. The fluorescence spectra of the four above benzenes indicate the presence of only one isomeric form in the ground and first excited singlet states. These result are consistant with the existance of a two-fold, but not a three-fold, axis of symmetry perpendicular to the molecular plane in the lowest triplet state (3Btu) of benzene. The configuration lifetime of an isomeric form is longer than the phosphorescence lifetime (∼10sec). Work supported in part by the National Science Foundation.

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1 M. S. de Groot and J. H. van der Waals, Mol. Phys. 6, 545 (1963).


Author Institution: Department of Chemistry, University of Rochester; Department of Chemistry, California Institute of Technology

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