Abstract
Using the technique of nuclear double resonance with spin mixing by level crossing, the nuclear quadrupole resonance of 14N has been measured in L-histidine, D-L-histidine, L-histidine hydrochloride monohydrate, sodium urocanate and urocanic acid at 77 K. The nuclear quadrupole resonance of both 14N and 2D has been measured in deuterated imidazole at 77 K. The previously measured spectra for normal imidazole have been positively assigned with the electric field gradient parameters for the tri-coordinated nitrogen site given by e 2 qQ/h = 1424 kHz and η = 0.980, and for the di-coordinated nitrogen site by e 2 qQ/h = 3267 kHz and η = 0.129.
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