Various monoionic montmorillonites were treated with an ethanol solution of O-(PToluenesulf onamido) aniline (abber. TSA) which is a highly specific reagent for precipitating cupric-chelate. These montmorillonite specimens were immersed in the ethanol solution of TSA for 4-5 days, and then air-dried. After this treatment, monoionic montmorillnites saturated with H
+, Fe
3+, Co
2+, Ni
2+, Mn
2+, Zn
2+, Cd
2+, Hg
2+, Mg
2+and Sr
2+ did not show remarkable change in their basal spacings (14.0-15.4 Å), whereas Cu
2+ saturated one clearly gave a basal spacing of 21Å under the condition of 0.3 g TSA/1 g specimen. These results indicate that the formation of the complex of montmorillonite-TSA having a 21Å spacing is due to the specificity of TSA. The authors inferred the structure of the complex having an upright orientation of TSA-assemblage in an interlayer, of montmorillonite.
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