14N NQR study of nicotinamide and related compounds.
14N nuclear quadrupole resonance (NQR) frequencies have been measured in picolinamide, nicotinamide, isonicotinamide, 2,6-pyridine dicarboxamide, and acetamide by double resonance. The 14N NQR spectra in picolinamide, nicotinamide, isonicotinamide, and 2,6-pyridine dicarboxamide show the presence of two distinct nitrogen positions: the ring position with the quadrupole coupling constant about 4,5 MHz and the amide position with the quadrupole coupling constant about 2.6 MHz. The NQR data are related to the structure of the investigated compounds and to the N--H...O hydrogen bonds.
Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia. janez.seliger@fmf.uni-lj.si
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J
Seliger
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V
Zagar
D000081:Acetamides / Q000737:chemistry*; D000577:Amides / Q000737:chemistry; D007536:Isomerism; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D015394:Molecular Structure; D009539:Nicotinic Acids / Q000737:chemistry*; D009584:Nitrogen; D010848:Picolinic Acids / Q000737:chemistry*
D000081:Acetamides; D000577:Amides; D009539:Nicotinic Acids; D010848:Picolinic Acids; C038997:nicotinanilide; C030686:acetamide; C003142:picolinamide; D009584:Nitrogen; C004860:dipicolinic acid