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It is shown that in almost all nitrile carbon-atoms T 1  depends first of all on the inter-and/or intramolecular dipol-dipol-relaxation mechanism. Only acetonitrile, as is already known, shows a remarkable dependence on the spin-rotation-relaxation mechanism. This influence is strongly decreasing with an increasing number of atoms, specially hydrogen atoms, in the molecule. The significance of the correlation time r is discussed extensively and the experimental results are verified by calculation of T 1  using the viscosity and the inertial moments as parameters.

Spin-Gitter-Relaxationszeit T 1 von Nitrilkohlenstoffen / Spin-Lattice-Relaxation Time T 1 of Nitrile Carbon-atoms