Abstract
The Cl and H nuclear magnetic resonance is used to examine the magnetic structure of antiferromagnetic KMnCl3·2H2O. The chemical unit cell contains two Mn ions surrounded by coordination octahedra which are edge linked to form a dimer. Within the dimer the two Mn spins are parallel. The over-all antiferro-magnetism is obtained by repeatedly translating the pair of parallel spins through a distance s and reversing their direction. The magnetic space group is Ps1̄. The most probable direction of the antitranslation s is along the a axis of the chemical unit cell. The magnetization direction lies 18° from the pseudofourfold symmetry axis of the coordination octahedra. Geometrically similar octahedra occur in MnCl2·2H2O but the nearest neighbor spins are antiparallel. From this fact we infer that the magnitude of the nearest neighbor exchange in such structures is quite small.
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