Abstract
Crystallization of 2RbBr · MnBr2 · 2H2O, the only double salt obtained under standard conditions from saturated aqueous rubidium–manganese bromide solutions, was theoretically predicted using the “hard” and “soft” Lewis acids and bases concept and Pauling's rules. The RbBr—MnBr2—H2O system was thermodynamically simulated by the Pitzer model assuming a solubility diagram of three branches only: RbBr, 2RbBr · MnBr2 · 2H2O and MnBr2 · 4H2O. The theoretical result was experimentally proved at 25°C by the physicochemical analysis method and formation of the new double salt 2RbBr · MnBr2 · 2H2O was established. It was found to crystallize in a triclinic crystal system, space group −P1, a = 5.890(1) Å, b = 6.885(1) Å, c = 7.367(2) Å, α = 66.01(1)°, β = 87.78(2)°, γ = 84.93(2)°, V = 271.8(1) Å3, Z = 1, D x = 3.552 g-cm−3. The binary and ternary ion interaction parameters were calculated and the solubility isotherm was plotted. The standard molar Gibbs energy of the synthesis reaction, ΔrG om , of the double salt 2RbBr · MnBr2 · 2H2O from the corresponding simple salts RbBr and MnBr2 · 4H2O, as well as the standard molar Gibbs energy of formation, ΔfG om , and standard molar enthalpy of formation ΔfH om of the simple and double salts were calculated.
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Balarew, C., Rabadjieva, D., Tepavitcharova, S. et al. Thermodynamic Study of the Aqueous Rubidium and Manganese Bromide System. Journal of Solution Chemistry 28, 949–958 (1999). https://doi.org/10.1023/A:1021792400558
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DOI: https://doi.org/10.1023/A:1021792400558