Titanyl sulfate

Titanyl sulfate

TiO^2+ [SO4^2−]
Identifiers
CAS Number	13825-74-6^Y
3D model (JSmol)	Interactive image
ChemSpider	9041905
ECHA InfoCard	100.034.098
PubChem CID	71312680 monohydrate
UNII	6XWR967CBZ^Y
CompTox Dashboard (EPA)	DTXSID20893951
SMILES [O-]S(=O)(=O)[O-].O=[Ti+2]
Properties
Chemical formula	O5STi
Molar mass	159.92 g·mol^−1
Density	1.3984 g/cm^3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Titanyl sulfate is the inorganic compound with the formula TiOSO₄. It is a white solid that forms by treatment of titanium dioxide with sulfuric acid, either directly or indirectly. It hydrolyzes to a gel of hydrated titanium dioxide. Characteristic of most titanium(IV) compounds with oxygen-containing ligands, the species also includes oxo ligands.[1]

Preparation

A number of methods provide titanium(IV) sulfates. One approach begins with K₂TiO(C₂O₄)₂·2H₂O, which can be obtained from hydrous titanium(IV) oxides. This salt is treated with hot aqueous sulfuric acid to degrade the oxalate:[2]

K₂TiO(C₂O₄)₂·2H₂O + 2 H₂SO₄ → K₂SO₄ + TiOSO₄ + 2 CO + 2 CO₂ + 4 H₂O

Structure

The structure consists of dense polymeric network with tetrahedral sulfur and octahedral titanium centers. The six ligands attached to titanium are derived from four different sulfate moieties and a bridging oxide. A monohydrate is also known, being prepared similarly to the anhydrous material. In the hydrate, one Ti–OS bond is replaced by Ti–OH₂.[3]

Structure of titanyl sulfate and its fragments

Hydrated TiOSO₄ showing packing

TiOSO₄, illustrating the connectivity between sulfate and titanium centers

TiOSO₄(H₂O), showing the presence of water

Color code: Ti = blue, O = red, and S = yellow

References

1. Heinz Sibum; Volker Günther; Oskar Roidl; Fathi Habashi; Hans Uwe Wolf (2005). "Titanium, Titanium Alloys, and Titanium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a27_095. ISBN 978-3-527-30673-2.
2. P. Ehrlich (1963). "Titanoxy Sulfate". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 2pages=1228. NY,NY: Academic Press.
3. Gatehouse, B. M.; Platts, S. N.; Williams, T. B. (1993). "Structure of Anhydrous Titanyl Sulfate, Titanyl Sulfate Monohydrate and Prediction of a New Structure". Acta Crystallographica Section B. 49 (3): 428–435. Bibcode:1993AcCrB..49..428G. doi:10.1107/S010876819201320X.