Tetrakis(dimethylamido)titanium

Tetrakis(dimethylamino)titanium (TDMAT), also known as Titanium(IV) dimethylamide, is a chemical compound. The compound is generally classified as a metalorganic species, meaning that its properties are strongly influenced by the organic ligands but the compound lacks metal-carbon bonds. It is used in chemical vapor deposition to prepare titanium nitride (TiN) surfaces and in atomic layer deposition as a titanium dioxide precursor. The prefix "tetrakis" refers the presence of four of the same ligand, in this case dimethylamides.

Tetrakis(dimethylamino)titanium
(IV)
Stereo wireframe model of tetrakis(dimethylamino)titanium(IV)
Names
Preferred IUPAC name
Tetrakis(dimethylamino)titanium(IV)
Systematic IUPAC name
Dimethyl[tris(dimethylamino)titanio]amine
Other names
Titanium(IV) dimethylamide
Identifiers
3D model (JSmol)
Abbreviations TDMAT
ChemSpider
ECHA InfoCard 100.019.914
EC Number
  • 221-904-3
UN number 2924

3398

  • InChI=1S/4C2H6N.Ti/c4*1-3-2;/h4*1-2H3;/q4*-1;+4 checkY
    Key: MNWRORMXBIWXCI-UHFFFAOYSA-N checkY
  • InChI=1S/4C2H6N.Ti/c4*1-3-2;/h4*1-2H3;/q4*-1;+4
    Key: MNWRORMXBIWXCI-UHFFFAOYSA-N
  • CN(C)[Ti](N(C)C)(N(C)C)N(C)C
Properties
C8H24N4Ti
Molar mass 224.19 g/mol
Appearance yellow liquid
Density 0.947 g/cm3
Boiling point 50 °C (122 °F; 323 K) at 0.05 mmHg
reacts with water
Hazards
GHS labelling:[1]
GHS02: FlammableGHS05: Corrosive
Danger
H225, H260, H314
P210, P223, P231+P232, P280, P303+P361+P353, P305+P351+P338
NFPA 704 (fire diamond)
NFPA 704 four-colored diamond
3
3
2
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)
Infobox references

Preparation and properties

Tetrakis(dimethylamino)titanium is a conventional Ti(IV) compound in the sense that it is tetrahedral and diamagnetic. Unlike the many alkoxides, the diorganoamides of titanium are monomeric and thus at least somewhat volatile. It is prepared from titanium tetrachloride (which is also tetrahedral, diamagnetic, and volatile) by treatment with lithium dimethylamide:[2]

TiCl4 + 4 LiNMe2 → Ti(NMe2)4 + 4 LiCl

Like many amido complexes, TDMAT is quite sensitive toward water, and its handling requires air-free techniques. The ultimate products of its hydrolysis is titanium dioxide and dimethylamine:

Ti(NMe2)4 + 2 H2O → TiO2 + 4 HNMe2

In a related reaction, the compound undergoes exchange with other amines, evolving dimethylamine.

See also

References
  1. GHS: Sigma Aldrich 469858
  2. D. C. Bradley and I. M. Thomas, "Part I. Metallo-organic Compounds containing Metal-Nitrogen bonds. Some Dialkylamino-derivatives of Titanium and Zirconium" J. Chem. Soc. 1960, 3857-3861. doi:10.1039/JR9600003857.


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