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ELECTRON-SPIN-RESONANCE AND ELECTRON NUCLEAR DOUBLE-RESONANCE STUDIES IN SINGLE-CRYSTALS OF N-METHYLUREA OXALIC-ACID (2/1)

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Title ELECTRON-SPIN-RESONANCE AND ELECTRON NUCLEAR DOUBLE-RESONANCE STUDIES IN SINGLE-CRYSTALS OF N-METHYLUREA OXALIC-ACID (2/1)
 
Creator KUMAR, MR
LINGAM, KV
RAO, TKG
 
Subject hydrogen-bonded protons
superhyperfine couplings
radical-anions
endor
 
Description Radicals trapped in a gamma-irradiated single crystal of N-methylurea oxalic acid have been investigated using the techniques of electron spin resonance (ESR) and electron nuclear double resonance (ENDOR). Detailed ENDOR studies have been carried out on the two initially observed radicals. One of these radicals has been assigned to a protonated anion. Two protons, belonging to neighboring molecules, have been identified as transferred protons. The other radical is formed at the urea molecule by hydrogen abstraction from the methyl group. The observed completely transferred proton exhibits very small isotropic coupling. The third radical seen, only in aged crystals, after prolonged duration has been assigned to a R-CHOH type of radical. These results are compared to those from the urea oxalic acid systems.
 
Publisher AMER INST PHYSICS
 
Date 2011-07-15T16:51:02Z
2011-12-26T12:49:35Z
2011-12-27T05:34:53Z
2011-07-15T16:51:02Z
2011-12-26T12:49:35Z
2011-12-27T05:34:53Z
1992
 
Type Article
 
Identifier JOURNAL OF CHEMICAL PHYSICS, 97(2), 900-907
0021-9606
http://dx.doi.org/10.1063/1.463194
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4330
http://hdl.handle.net/10054/4330
 
Language en