Titanium(IV) nitrate

Titanium nitrate is the inorganic compound with formula Ti(NO₃)₄. It is a colorless, diamagnetic solid that sublimes readily. It is an unusual example of a volatile binary transition metal nitrate. Ill defined species called titanium nitrate are produced upon dissolution of titanium or its oxides in nitric acid.

Similarly to its original method, Ti(NO₃)₄ is prepared by the nitration of titanium tetrachloride using dinitrogen pentoxide or chlorine nitrate:

TiCl₄ + 4 N₂O₅ → Ti(NO₃)₄ + 4 ClNO₂

Hydrated titanium nitrate, the nitrate salt of the aquo complex [Ti(H₂O)₆]³⁺, is produced upon dissolution of titanium compounds in nitric acid.

The complex has D_2d symmetry, with four bidentate nitrate ligands. The N-O distances are 1·29 Å and 1·185 Å (noncoordinated).

In the infrared spectrum, it absorbs strongly at 1635 cm⁻¹, assigned to a N-O vibrational mode.

It is soluble in nonpolar solvents silicon tetrachloride and carbon tetrachloride.

Titanium nitrate is hygroscopic, converting to ill-defined hydrates. The anhydrous material is highly reactive, even toward hydrocarbons. Titanium nitrate also reacts with n-dodecane, p-dichlorobenzene, anisole, biphenyl,

It decomposes thermally to titanium dioxide.

• Partington, J. R.; A. L. Whynes (1949). "660. Reactions of nitrosyl chloride. Part II". Journal of the Chemical Society (Resumed): 3135. doi:10.1039/JR9490003135. ISSN 0368-1769.
• Dauerman, L.; G.E. Salser (1973). "Mass spectra of covalent inorganic nitrates: copper(II) nitrate and titanium(IV) nitrate". Journal of Inorganic and Nuclear Chemistry. 35 (1): 304–306. doi:10.1016/0022-1902(73)80643-8. ISSN 0022-1902.