Vanadium(II) sulfate

Vanadium(II) sulfate
Identifiers
CAS Number	13566-06-8 ;
3D model (JSmol)	anhydrous: Interactive image; hexahydrate: Interactive image;
ECHA InfoCard	100.233.281
PubChem CID	166848 anhydrous; 22613976 heptahydrate;
UNII	IO5B4EXJYI ;
CompTox Dashboard (EPA)	DTXSID60929102 ;
	SMILES anhydrous: [V+2].[O-]S([O-])(=O)=O; hexahydrate: [OH2+][V-4]([OH2+])([OH2+])([OH2+])([OH2+])[OH2+].[O-]S(=O)(=O)[O-];
Properties
Chemical formula	H12O10SV
Molar mass	255.09 g·mol−1
Appearance	violet solid
Density	1.910 g/cm3
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Vanadium(II) sulfate describes a family of inorganic compounds with the formula VSO₄(H₂O)_x where 0 ≤ x ≤ 7. The hexahydrate is most commonly encountered. It is a violet solid that dissolves in water to give air-sensitive solutions of the aquo complex. The salt is isomorphous with [Mg(H₂O)₆]SO₄. Compared to the V–O bond length of 191 pm in [V(H₂O)₆]³⁺, the V–O distance is 212 pm in the [V(H₂O)₆]SO₄. This nearly 10% elongation reflects the effect of the lower charge, hence weakened electrostatic attraction.^[1]

The heptahydrate has also been crystallized. The compound is prepared by electrolytic reduction of vanadyl sulfate in sulfuric acid.^[1]^[2] The crystals also feature [V(H₂O)₆]²⁺ centers but with an extra water of crystallization. The salt is isomorphous with ferrous sulfate heptahydrate.^[3] A related salt is vanadous ammonium sulfate, (NH₄)₂V(SO₄)₂·6H₂O, a Tutton's salt isomorphous with ferrous ammonium sulfate.^[4]

References

^ ^a ^b Cotton, F. A.; Falvello, L. R.; Llusar, R.; Libby, E.; Murillo, C. A.; Schwotzer, W. (1986). "Synthesis and Characterization of Four Vanadium(II) Compounds, Including Vanadium(II) Sulfate Hexahydrate and Vanadium(II) Saccharinates". Inorganic Chemistry. 25 (19): 3423–3428. doi:10.1021/ic00239a021.
^ Kranz, M. (1963). "Vanadium(II) Sulfate". Inorganic Syntheses. Inorganic Syntheses. Vol. 7. pp. 94–96. doi:10.1002/9780470132388.ch29. ISBN 978-0-470-13238-8.
^ Cotton, F. A.; Falvello, L. R.; Murillo, C. A.; Pascual, I.; Schultz, A. J.; Tomas, M. (1994). "Neutron and X-Ray Structural Characterization of the Hexaaquavanadium(II) Compound V(SO₄)·7H₂O". Inorganic Chemistry. 33 (24): 5391–5395. doi:10.1021/ic00102a009.
^ Montgomery, H.; Morosin, B.; Natt, J. J.; Witkowska, A. M.; Lingafelter, E. C. (1967). "The crystal structure of Tutton's salts. VI. Vanadium(II), iron(II) and cobalt(II) ammonium sulfate hexahydrates". Acta Crystallographica. 22 (6): 775–780. Bibcode:1967AcCry..22..775M. doi:10.1107/S0365110X67001550.

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[FAC1-1] Cotton, F. A.; Falvello, L. R.; Llusar, R.; Libby, E.; Murillo, C. A.; Schwotzer, W. (1986). "Synthesis and Characterization of Four Vanadium(II) Compounds, Including Vanadium(II) Sulfate Hexahydrate and Vanadium(II) Saccharinates". Inorganic Chemistry. 25 (19): 3423–3428. doi:10.1021/ic00239a021.

[2] Kranz, M. (1963). "Vanadium(II) Sulfate". Inorganic Syntheses. Inorganic Syntheses. Vol. 7. pp. 94–96. doi:10.1002/9780470132388.ch29. ISBN 978-0-470-13238-8.

[3] Cotton, F. A.; Falvello, L. R.; Murillo, C. A.; Pascual, I.; Schultz, A. J.; Tomas, M. (1994). "Neutron and X-Ray Structural Characterization of the Hexaaquavanadium(II) Compound V(SO₄)·7H₂O". Inorganic Chemistry. 33 (24): 5391–5395. doi:10.1021/ic00102a009.

[4] Montgomery, H.; Morosin, B.; Natt, J. J.; Witkowska, A. M.; Lingafelter, E. C. (1967). "The crystal structure of Tutton's salts. VI. Vanadium(II), iron(II) and cobalt(II) ammonium sulfate hexahydrates". Acta Crystallographica. 22 (6): 775–780. Bibcode:1967AcCry..22..775M. doi:10.1107/S0365110X67001550.

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