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Tetrakis(dimethylamido)titanium

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Tetrakis(dimethylamino)titanium
(IV)
Stereo wireframe model of tetrakis(dimethylamino)titanium(IV)
Stereo wireframe model of tetrakis(dimethylamino)titanium(IV)
Names
Preferred IUPAC name Tetrakis(dimethylamino)titanium(IV)
Systematic IUPAC name Dimethylamine
Other names Titanium(IV) dimethylamide
Identifiers
CAS Number
3D model (JSmol)
Abbreviations TDMAT
ChemSpider
ECHA InfoCard 100.019.914 Edit this at Wikidata
EC Number
  • 221-904-3
PubChem CID
UN number 2924

3398

CompTox Dashboard (EPA)
InChI
  • InChI=1S/4C2H6N.Ti/c4*1-3-2;/h4*1-2H3;/q4*-1;+4Key: MNWRORMXBIWXCI-UHFFFAOYSA-N
  • InChI=1S/4C2H6N.Ti/c4*1-3-2;/h4*1-2H3;/q4*-1;+4Key: MNWRORMXBIWXCI-UHFFFAOYSA-N
SMILES
  • CN(C)(N(C)C)(N(C)C)N(C)C
Properties
Chemical formula C8H24N4Ti
Molar mass 224.19 g/mol
Appearance yellow liquid
Density 0.947 g/cm
Boiling point 50 °C (122 °F; 323 K) at 0.05 mmHg
Solubility in water reacts with water
Hazards
GHS labelling:
Pictograms GHS02: FlammableGHS05: Corrosive
Signal word Danger
Hazard statements H225, H260, H314
Precautionary statements P210, P223, P231+P232, P280, P303+P361+P353, P305+P351+P338
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g. gasolineInstability 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g. white phosphorusSpecial hazards (white): no code
3 3 2
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). ☒N verify (what is  ?) Infobox references
Chemical compound

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.

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:

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.


TMAT has been used in metalorganic chemical vapor deposition (MOCVD).

Related compounds

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.
Titanium compounds
Titanium(II)
Organotitanium(II) compounds
Titanium(III)
Organotitanium(III) compounds2
Titanium(IV)
Titanate compounds
Organotitanium(IV) compounds
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