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14N Chemical Shifts and Quadrupole Coupling Constants of Inorganic Nitrates

✍ Scribed by Simon P. Marburger; B.M. Fung; A.K. Khitrin

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
62 KB
Volume
154
Category
Article
ISSN
1090-7807

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✦ Synopsis

The isotropic chemical shift and the nuclear quadrupole coupling constant for 14 N were obtained for 14 inorganic nitrates by solidstate MAS NMR measurements at two different field strengths, 9.4 and 11.7 T. The compounds studied were polycrystalline powders of AgNO 3 , Al(NO 3 ) 3 , Ba(NO 3 ) 2 , Ca(NO 3 ) 2 , CsNO 3 , KNO 3 , LiNO 3 , Mg(NO 3 ) 2 , NaNO 3 , Pb(NO 3 ) 2 , RbNO 3 , Sr(NO 3 ) 2 , Th(NO 3 ) 4 β€’ 4H 2 O, and UO 2 (NO 3 ) 2 β€’ 3H 2 O. Even though the spectra show broadening due to 14 N quadrupole interactions, linewidths of a few hundred hertz and a good signal-to-noise ratio were achieved. From the position of the central peaks at the two fields, the chemical shifts and the nuclear quadrupole coupling constants were calculated. The chemical shifts for all compounds studied range from 282 to 342 ppm with respect to NH 4 Cl. The nuclear quadrupole coupling constants range from 429 kHz for AgNO 3 to 993 kHz for LiNO 3 . These data are compared with those available in the literature.

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