Synthesis, thermal, XRD and spectroscopic studies characterization of Tutton salt K2M (SO4)2·6H2O (M = Mg, Ni)

• Crystals of K2M (SO4)2·6H2O (with M = Mg, Ni) have been grown by slow evaporation.
• The crystals were characterized with X-ray diffraction (monoclinic with space group P21/a)
• Vibration frequencies of SO42− and H2O molecules confirmed by Raman and IR.

Tutton’s salts K2M(SO4)2·6H2O (M = Mg, Ni) have been synthesized by the slow evaporation method at room temperature. A complete structural characterization has been carried out by means of powder X-ray diffraction (XRD). The results indicate that the structure of these salts is monoclinic system with the space group P21/a (Z = 2). IR and Raman spectra of KMS6 (M = Mg,Ni) have been recorded and analyzed. From the spectra, the vibrations due to SO42− ion, the complex [M(H2O)6]2+ and the water molecules have been identified. Thermogravimetry, differential thermal analysis and XRD at high-temperature investigations show that the dehydration of these salts occurs between 300 and 500 K. This indicates the removal of all water molecules around 426 K.

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