Abstract
Abstract The deuteron magnetic resonance of single crystals of aquopentamminecobalt(III) perchlorate was measured at various temperatures. The observed quadrupole coupling shows that [Co(ND3)5(D2O)]3+ ions execute a rapid isotropic reorientation at high temperatures (above 320°K), while only a C3 axis reorientation of the ligand ND3groups is present at low temperatures (below 290°K). No anisotropic uniaxial reorientation was observed about the C4 axis parallel to the Co–(D2O) direction. At temperatures between 310°K and 320°K, the spectrum of a fast exchange limit was observed, together with the spectrum of a slow exchange limit. This anomaly may be explained by the classical rotation of the D2O ligand.
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