ELECTRON-SPIN-RESONANCE AND ELECTRON NUCLEAR DOUBLE-RESONANCE STUDIES IN SINGLE-CRYSTALS OF N-METHYLUREA OXALIC-ACID (2/1)
DSpace at IIT Bombay
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Title |
ELECTRON-SPIN-RESONANCE AND ELECTRON NUCLEAR DOUBLE-RESONANCE STUDIES IN SINGLE-CRYSTALS OF N-METHYLUREA OXALIC-ACID (2/1)
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Creator |
KUMAR, MR
LINGAM, KV RAO, TKG |
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Subject |
hydrogen-bonded protons
superhyperfine couplings radical-anions endor |
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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.
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Publisher |
AMER INST PHYSICS
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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 |
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Type |
Article
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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 |
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Language |
en
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