Abstract

The electron spin resonance absorption spectrum of pyrene-d/sub 10/ in benzophenone has been observed at -20/sup 0/C. The analysis was accomplished by rotating about the laboratory fixed a, b, and c crystallographic axes rather than the molecular axes and using a limited self-consistent procedure. The zfs parameters are the same as those that have been previously reported for pyrene-d/sub 10/ in fluorene. Though pyrene does not fit perfectly into a benzophenone substitutional site the molecules are nearly coplanar with their long axes differing by 3/sup 0/.

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