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Deuterium isotope effects on 14 N and 15 N nuclear shielding in simple nitrogen‐containing compounds
Author(s) -
Lyc̆ka Antonin,
Hansen Poul Erik
Publication year - 1985
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260231118
Subject(s) - chemistry , deuterium , kinetic isotope effect , acetanilide , nitrogen , solvent , isotope , ammonium , radiochemistry , isotopes of nitrogen , inorganic chemistry , organic chemistry , physics , quantum mechanics
Deuterium isotope effects on the 14 N and 15 N nuclear shielding of simple nitrogen‐containing compounds have been investigated. Very similar positive values for 1 ΔN(D) have been observed in a series of amides and amines, excluding ammonium ions. Negative values of the deuterium isotope effect over three bonds are observed in acetonitrile and acetanilide. Both coaxial tube and single tube methods have been used, and show comparable results. The additivity of isotope effects over one bond is found to hold for ammonium compounds and amides. Solvent effects were investigated and are shown to be important. The origin of the solvent effects is ascribed to hydrogen bonding.