Excited Electronic States of Nitroaromatic Compounds.
BALLISTIC RESEARCH LABS ABERDEEN PROVING GROUND MD
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Experimental triplet lifetimes have been obtained for 1-nitronaphthalene 48 msec and 1,4-dinitronaphthalene 21 msec in EPA solutions at 77K by luminescence spectroscopy and electron spin resonance. Both techniques have yielded identical lifetimes within experimental error. Emission spectra have been determined and corrected for nonlinear monochromator and photomultiplier response. In addition mean zero-field splitting parameters have been determined for 1-nitronaphthalene D 0.0893cm and 1,4-dinitronaphthalene D 0.0818. These values indicate that the excited triplet state for these triplet 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. This represents the first definitive observation of any tripletpi, n state by spin resonance techniques. Author
- Organic Chemistry
- Atomic and Molecular Physics and Spectroscopy