Titanium(IV) nitrate

Not to be confused with Titanium nitride.

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.

Titanium(IV) nitrate

Ball-and-stick model[1][2]
Names
Other names titanium tetranitrate, tetranitratotitanium
Identifiers
CAS Number	12372-56-4 N
3D model (JSmol)	Interactive image
ChemSpider	8123716 N
ECHA InfoCard	100.222.601
PubChem CID	139314
CompTox Dashboard (EPA)	DTXSID50924580
InChI InChI=1S/4NO3.Ti/c4*2-1(3)4;/q4*-1;+4 Key: QDZRBIRIPNZRSG-UHFFFAOYSA-N
SMILES [Ti](O[N+]([O-])=O)(O[N+]([O-])=O)(O[N+]([O-])=O)O[N+]([O-])=O
Properties
Chemical formula	Ti(NO3)4
Molar mass	295.8866 g/mol
Appearance	white volatile solid
Density	2.192[3]
Melting point	58[4] °C (136 °F; 331 K)
Boiling point	decompose
Solubility in water	Reacts[5]
Structure[6]
Crystal structure	monoclinic
Space group	P21/C
Lattice constant	a = 7.80, b = 13.57, c = 10.34 Å α = 90°, β = 125·0°, γ = 90°
Lattice volume (V)	896.52 Å3
Formula units (Z)	4
Coordination geometry	8
Molecular shape	flattened tetrahedral
Related compounds
Related compounds	hafnium nitrate, zirconium nitrate, titanium phosphate, titanium perchlorate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation

Similarly to its original method,^[7][8] Ti(NO₃)₄ is prepared by the nitration of titanium tetrachloride using dinitrogen pentoxide^[9] or chlorine nitrate:^[10]

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.^[11]

Structure

The complex has D_2d symmetry, with four bidentate nitrate ligands. The N-O distances are 1·29 Å and 1·185 Å (noncoordinated).^[6]

Physical properties

In the infrared spectrum, it absorbs strongly at 1635 cm⁻¹, assigned to a N-O vibrational mode.^[12]

It is soluble in nonpolar solvents silicon tetrachloride and carbon tetrachloride.^[13][8]

Reactions

Titanium nitrate is hygroscopic, converting to ill-defined hydrates.^[14] The anhydrous material is highly reactive, even toward hydrocarbons.^[14] Titanium nitrate also reacts with n-dodecane,^[15] p-dichlorobenzene, anisole, biphenyl,^[15][16]

It decomposes thermally to titanium dioxide.^[17]