Abstract
Precise NMR measurements of 14N screening constants relative to those of neat nitromethane as external standard in concentric spherical sample containers show that external and internal referencing systems which have so far been used are not suitable for nitrogen shift calibration with an accuracy of the order of 0.1 ppm. Accurate data are reported for recalculating nitrogen shifts referred to various external and internal standards. Neat nitromethane is recommended as a primary reference substance. The role of solvent and concentration effects on nitrogen chemical shifts is indicated for a few selected molecules.
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