Solubility of [C60(=C(COOH)2)3] in the [C60(=C(COOH)2)3]-SmCl3-H2O ternary system at 25°C
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The solubility diagram for the C60(=C(COOH)2)3-SmCl3-H2O ternary system at 25°C is studied by means of isothermal saturation in sealed vials. The compositions of saturated solutions are determined by a combination of the methods of titrimetric (chelatometric) and spectrophotometric (from electronic absorption spectra) chemical analysis. It is established that the solubility diagram of the specified system is a simple eutonic and consists of two branches that correspond to the crystallization of C60(=C(COOH)2)3·3H2O and SmCl3·6H2O crystalline hydrates and contains one invariant point: the eutonic point corresponding to the joint crystallization of both solid phases of constant composition. It is found that the eutonic mixture is strongly enriched by one of the components, SmCl3, while on the C60(=C(COOH)2)3·3H2O crystallization branch, which occupies an overwhelming part of the ternary diagram, the express salting-out of C60(=C(COOH)2)3 is observed upon an increase in the concentration of the salt component, i.e., SmCl3.
Keywordscarboxylated fullerene samarium chloride solubility
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- 4.M. V. Charykova and N. A. Charykov, Thermodynamic Modeling of Evaporite Sedimentation (Nauka, St. Petersburg, 2003) [in Russian].Google Scholar