Tetrakis(dimethylamido)titanium
| Tetrakis(dimethylamino)titanium (IV) | |
|---|---|
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| Tetrakis(dimethylamino)titanium(IV) | |
| Systematic name Dimethyl[tris(dimethylamino)titanio]amine | |
| Other names Titanium(IV) dimethylamide | |
| Identifiers | |
| Abbreviations | TDMAT |
| CAS number | 3275-24-9  |
| PubChem | 123185  |
| ChemSpider | 13870283 |
| EC number | 221-904-3 |
| UN number | 2924 3398 |
| Jmol-3D images | {{#if:CN(C)[Ti](N(C)C)(N(C)C)N(C)C|Image 1 |
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| Properties | |
| Molecular formula | C8H24N4Ti |
| Molar mass | 224.19 g/mol |
| Appearance | yellow liquid |
| Density | 0.947 g/cm³ |
| Boiling point | 50 °C at 0.05mmHg |
| Solubility in water | reacts with water |
| Hazards | |
| EU classification | ? |
| R-phrases | 11-14-34 |
| S-phrases | 16 - 26 - 36/37/39 - 43 - 45 |
| NFPA 704 |
 3
3
2
|
| (verify) (what is: /?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa) | |
| Infobox references | |
Tetrakis(dimethylamino)titanium (TDMAT) 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 a titanium nitride (TiN) surfaces. 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:[1]
- 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 product of its hydrolysis is titanium dioxide:
- Ti(NMe2)4 + 2 H2O → TiO2 + 4 HNMe2
In a related reaction, the compound undergoes exchange with other amines, evolving dimethylamine.
See also
- Metalorganic chemical vapor deposition (MOCVD), general process which includes using TDMAT but also uses many other gases to layer other substances.
References
- ↑ 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.