The solubility diagram of the quaternary system С60(ОН)24 – NdCl3 – PrCl3 – H2O and its ternary subsystems at 25°C was studied by the method of isothermal saturation in ampoules. In systems С60(ОН)24 – NdCl3 – PrCl3 – H2O and NdCl3 – PrCl3 – H2O isovalent substitution solid solutions crystallize with the miscibility gap (PrCl3)х(NdCl3)1-х•6H2O and (PrCl3)х(NdCl3)1-х•7H2O. In all systems there is one non-invariant point of the eutonic type corresponding to the saturation of the solution with two solid phases in the ternary subsystems and three solid phases in the quaternary system
Solubility in triple water-salt systems containing LaCl3, GdCl3, SmCl3 chlorides and water-soluble fullerenol C60(OH)24 at 25oC was studied by the method of isothermal saturation in ampoules. The analysis for the content of rare earth elements was carried out by atomic absorption spectroscopy, for the content of fullerenol – by electronic spectrophotometry. Solubility diagrams in all four ternary systems are simple eutonic, both consist of two branches corresponding to the crystallization of fullerenol crystallohydrate and rare earth elements chloride crystallohydrates, and contain one non-invariant point corresponding to saturation with both solid phases. On the long branches of crystallization of C60(OH)24, a pronounced salting effect is observed – the solubility of C60(OH)24•18H2O decreases by a factor of more than a hundred compared with the solubility of fullerenol in water. On very short branches of crystallization of LaCl3•7H2O, GdCl3•6H2O, SmCl3•6H2O, the effect of salting-in effect is clearly observed, the solubility of all four chlorides increases markedly. All diagrams cannot be accurately approximated by Sechenov monoparametric equation – SE – and are very accurately approximated by Sechenov trinomial modified three-parameter equation SEM-3. Comparison of calculations in similar triple systems containing water-soluble fullerenol C60(OH)24 and NaCl, CuCl2, UO2Cl2 shows the applicability of the classical SE model to systems with NaCl, SEM-3 model and the four-parameter SEM-4 model for a system with UO2Cl2
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