EXPERIMENTAL TRIPLET LIFETIMES AND MEAN ZERO-FIELD SPLITTING PARAMETERS (D*) FOR SOME NITRONAPHTHALENES
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Date
1970
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Ohio State University
Abstract
Experimental triplet lifetimes have been obtained for 1-nitronaphthalene (48 msec) and 1,4-dinitronaphthalene (21 msec) in EPA solutions at $77^\circ K$ by luminescence spectroscopy and electron spin resonance. Both techniques have yielded indentical lifetimes within experimental error. In addition mean zero-field splitting parameters have been determined for 1-nitronaphthalene ($D^{*}=0.0893$ $cm^{-1}$) and for 1,4-dinitronaphthalene (D* = 0.0818). These values indicate that the excited triplet state for these $^{3}\pi^{*}$, n) states is no longer localized within the nitro group which implies that electronic charge is transferred from the nitro group into the aromatic ring.
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Author Institution: U.S. Army Ballistic Research Labs.