Abstract
The quadrupolar coupling constants of nitrogen-14 and oxygen-17 in 2-pyrrolidone, δ-valerolactam and ε-caprolactam in H2O and CCl4 solutions have been determined by using the 14N and 17O n.m.r. linewidths and carbon-13 relaxation times. Within the limits of experimental error affecting these parameters, the quadrupolar couplings of 14N and 17O have been found to be independent of ring size; this is corroborated by Townes–Dailey calculations. Furthermore, quadrupolar relaxation of 14N and 17O has proved to be a valuable aid towards a total analysis of the anisotropic motion of 2-pyrrolidone.
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