Crystallization in the Three-Component Systems Rb₂SO_4-MSO_4-H₂O (M = Mg, Co, Ni, Cu, Zn) at 298 K

Veronika Karadjova, Donka Stoilova

Department of Inorganic Chemistry, University of Chemical Technology and Metallurgy, Sofia, Bulgaria; 2Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria..

DOI: 10.4236/jcpt.2013.34022                

Abstract

The crystallization in the three-component systems Rb₂SO₄-MSO₄-H₂O (M = Mg, Co, Ni, Cu, Zn) is studied by the method of isothermal decrease of supersaturation. It has been established that isostructural double compounds,

Rb₂M(SO₄)₂·6H₂O (M = Mg, Co, Ni, Cu, Zn), , crystallize from the ternary solutions within wide

concentration ranges. The infrared spectra are discussed with respect to the normal vibrations of the sulfate ions and water molecules. The unit-cell group theoretical treatment of the double salts is presented. The extent of energetic distortions of guest ions (about 2 mol%) matrix-isolated in the respective selenates, (M' = K, Rb, ; M" = Mg, Co, Ni, Cu, Zn), is commented.

Keywords

Rb2Me(SO4)2·6H2O (Me = Mg, Co, Ni, Cu, Zn); Solubility Diagrams; X-Ray Powder Diffraction; Infrared Spectra; Matrix Infrared Spectroscopy

Conflicts of Interest

The authors declare no conflicts of interest.

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