Excited Electronic States of Nitroaromatic Compounds.
Abstract
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* = 0.0893/cm) 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 triplet(pi*, n) state by spin resonance techniques. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1970
- Accession Number
- AD0716577
Entities
People
- Ingo W. May
- John R. Kelso
Organizations
- Ballistic Research Laboratory