NMR of a Glycine Single Crystal

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Abstract
The NMR absorption of a glycine single crystal was observed at 77° and 293°K for various orientations of the sample in the external magnetic field. On the basis of theoretical second moments computed from Van Vleck's equation it is concluded that the NH3+ group is a regular tetrahedron whose axis lies along the C–N bond. The N–H bond distance was determined to be 1.077±0.01 A. It is concluded from the agreement between the computed and observed angular dependence of the second moments that the proposed model is correct.

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