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Spin—lattice relaxation process of the three-proton group in solids has been studied for many years, while NMR relaxation experiments have turned out to be a powerful tool in the analysis of the molecular dynamics of such a system. In most cases quantum aspects of this kind of molecular reorientations have been considered. Tunnelling, which is influenced both by intraand intermolecular interactions, reflects the molecular environment of a given group. However, the classical description of the reorientation in the high temperature range is also of some importance, particularly in the case, when the three-spin group plays an important role in the crystal lattice phase transition (see e.g. [1]). In the system of three-proton groups in a solid the most effective mechanism of proton spin—lattice relaxation is the dipole-dipole interaction between the nuclei within the group and between these protons and any other nucleus. In the first case one considers a system of isolated three-proton groups, where only a homonuclear interaction is taken into account [2-5]. In the other case the homonuclear as well as the heteronuclear interaction is analysed. The system of pairs of the three-proton groups has been already described [7-10]. This short communication presents the analysis of the change of the relaxation rate caused by the dipole—dipole interaction between the protons within the group and a single, motionless proton from the same or another molecule. A similar system has been analysed before by Michel and Rössiger [10]. Below the results of both analyses are compared.

Influence of Intermolecular Dipolar Interaction on Spin-Lattice Relaxation of the Three-Proton Group