The "N electric quadrupole coupling constants and asymmetry parameters have been detetmioed for the three chemicalIy oooequivalent nitrogen sites in both 4-(N,Ndimethyhunioo)-3-acetamidonitrobeozeoe (DAN) and ( -)-2-(a-methylbenzylomamino)-5-oitropyridine (MBANP) with the help of proton-nitrogen ouc
14N quadrupole coupling in COANP
✍ Scribed by J. Seliger; V. Ẑagar; R. Blinc; H. Arend; P. Günter
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 134 KB
- Volume
- 142
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The r4N electric quadrupole coupling constants and asymmetry parameters have been determined for the three chemically nonequivalent nitrogen sites in 2-cycle-octyl-amino+nitropyridine (COANP) with the help of proton-nitrogen nuclear quadrupole double resonance.
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hIi E&C 5% nuclear quadrupoJ? resonances in imidazole were observed. U&g deuterafed samples, the EQR of the deuterium in P&-C bond and the first unamb~~ous ideu~ication of t.be quadrupole couplkg constants at a bi-coordinate N site were cbtaiaed.
The temperature dependence of the proton-t4N double resonance spectra demonstrates that thermochromism in solid N-S&lorosalicylideneaniline is accompanied by intramolecular proton transfer and an enol-keto transformation.
The technique of pulsed nitrogen-proton double resonance in the rotating f?ame has been used to determine the electric field gradient (EFG) tensors at the t4N sites in paraelectric (NH&S04. The results show that the NH:-ions are highly distorted and that there are two chemically nonequivalent sets
## Abstract Using high‐field NMR, we have determined the magnitude of the nuclear quadrupole interaction in hexamethylene triperoxide diamine (HMTD), the explosive allegedly used in the London bombings of July 2005. The experimental quadrupolar coupling constant, 5.334 MHz, is in good agreement wit