Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
14N Nuclear Quadrupole Resonances of 2-Aminopyrimidine
Hisao NegitaKaoru ShibataTsuneo Kubo
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1973 Volume 46 Issue 1 Pages 110-113

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Abstract

Four nuclear quadrupole resonance (NQR) lines due to 14N nuclei of the ring nitrogens in 2-aminopyrimidine were paired for the powder sample by use of a frequency-modulated spectrometer and a Helmholtz coil for the Zeeman field (H). NQR parameters e2Qq=3707.2 kHz and η=0.0646 were obtained for one nitrogen, and e2Qq=3759.6 kHz and η=0.0329 for the other. Moreover, the frequency of the lower line of a pair of lines for the amino nitrogen was predicted from the shift of the higher line subjected to the Zeeman field in a single crystal. The region around the expected position was carefully swept and a very weak line was found at 2357.8 kHz. Thus e2Qq=3428.0 kHz and η=0.2488 were deduced for the amino nitrogen. The quadrupole coupling constant for the amino nitrogen in 2-aminopyrimidine was smaller than that for the amino nitrogen in 2-aminopyridine. The asymmetry parameter for the amino nitrogen in 2-aminopyrimidine was smaller than that for the amino nitrogen in 2-aminopyridine and roughly equal to that for the amino nitrogen in aniline.

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