Quadrupolar interactions in amines as determined by 1H nuclear magnetic resonance: mono- and dimethylamines

Nitrogen-14 quadrupole interactions have been observed in the nonexchanging amino proton 1 H nmr spectra of rigorously purified liquid mono- and dimethylamines over the temperature range −82 °C to +81 °C. The proton lineshapes have been analyzed to yield 14 N spin-lifetimes (τ) as a function of temperature. Activation energies and correlation times for molecular reorientation in the liquids have been calculated from these data and the results compared with those from 14 N nmr measurements.