Crystal Growth and Structural Characterization of Tutton Salts

Tutton salts constitute a family of isomorphic double sulphate hydrates with the general formula M2M′(SO4)2·6H2O, in which divalent metal ions occupy octahedral sites coordinated by six water molecules. These materials crystallise in a monoclinic structure, typically in the P21/a space group, and exhibit a robust hydrogen-bonded network linking [M′(H2O)6]2+ octahedra and SO42– tetrahedra. Their well-defined frameworks and reversible dehydration–rehydration cycles make them attractive for applications ranging from thermochemical heat storage to ultraviolet optical filtering. Growth of large, high-quality crystals is most often achieved by slow solvent evaporation or controlled cooling of aqueous solutions, yielding transparent specimens suitable for single-crystal X-ray diffraction. Structural characterisation combines powder and single-crystal diffraction with spectroscopic and computational techniques to elucidate lattice dynamics, intermolecular interactions and electronic properties. A detailed understanding of cation substitution, lattice defects and phase transformations has advanced both fundamental crystal chemistry and practical development of Tutton salts for energy and optical technologies.

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Crystal Growth and Structural Characterization of Tutton Salts publication trend

The graph below shows the total number of articles in crystal growth and structural characterization of tutton salts across all publications each year (not limited to Nature Index journals).

Technical terms

Tutton salts: A class of isomorphic double sulphate hydrates with formula M2M′(SO4)2·6H2O, featuring octahedral water‐coordinated metal centres and hydrogen‐bonded frameworks.

Powder X-ray diffraction (PXRD): A technique for determining phase purity, lattice parameters and crystallite structure by analysing diffraction patterns from powdered samples.

Rietveld refinement: A quantitative method for refining crystal structures by fitting calculated diffraction profiles to observed powder diffraction data.

Hirshfeld surface analysis: A computational approach to visualise and quantify intermolecular contacts and surface topology within a crystal lattice.

Jahn–Teller effect: A distortion of coordination complexes that reduces electronic degeneracy, influencing bond lengths and angles in octahedral sites.

Dehydration enthalpy: The heat absorbed or released during removal of water molecules from a hydrated crystal, critical for assessing thermochemical storage performance.

References

1. Assessing the Novel Mixed Tutton Salts K2Mn0.03Ni0.97(SO4)2(H2O)6 and K2Mn0.18Cu0.82(SO4)2(H2O)6 for Thermochemical Heat Storage Applications: An Experimental–Theoretical Study. Molecules (2023).
2. Tutton salt (NH4)2Zn(SO4)2(H2O)6: thermostructural, spectroscopic, Hirshfeld surface, and DFT investigations. Journal of Molecular Modeling (2024).
3. Temperature-Induced Phase Transformations in Tutton Salt K2Cu(SO4)2(H2O)6: Thermoanalytical Studies Combined with Powder X-Ray Diffraction. Physchem (2024).