Abstract

The stereochemistry of some hydrated ions on the interlamellar surfaces of bentonite has been investigated by spectroscopic methods. The coordination of adsorbed ions estimated on the basis of d₀₀₁ values has been confirmed by diffuse reflectance and ESR spectra. When the d₀₀₁ value is ~ 12.4 Å a monolayer of water occupies the « interlayer »; the ion is coordinated to four water molecules in the xy plane and to two silicate oxygens along the z axis. When the d₀₀₁ value is 14-3 Å two layers of water occupy the «interlayer »; the ion is octahedrally coordinated to six water molecules and the symmetry axis of the acqueous-complex is inc1ined with respect to the sili· cate layers at an angle of 45º When the d₀₀₁ value is ~15.0 Å, three layers of water are present in the interlayer; the ion is octahedrally coordinated to six water molecules but the symmetry axis is perpendicular to the silicate layers.

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