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Names | |||
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Preferred IUPAC name
1,1,1-Trimethyl-N-(trimethylsilyl)silanamine[1] | |||
Other names
Bis(trimethylsilyl)azane
Bis(trimethylsilyl)amine 1,1,1,3,3,3-Hexamethyldisilazane Hexamethyldisilazane | |||
Identifiers | |||
3D model (JSmol)
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Abbreviations | HMDS | ||
635752 | |||
ChEBI | |||
ChemSpider | |||
ECHA InfoCard | 100.012.425 | ||
EC Number |
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MeSH | Hexamethylsilazane | ||
PubChem CID
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RTECS number |
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UNII | |||
UN number | 2924, 3286 | ||
CompTox Dashboard (EPA)
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Properties | |||
C6H19NSi2 | |||
Molar mass | 161.395 g·mol−1 | ||
Appearance | Colorless liquid | ||
Density | 0.77 g cm−3 | ||
Melting point | −78 °C (−108 °F; 195 K) | ||
Boiling point | 126 °C (259 °F; 399 K) | ||
Slow hydrolysis | |||
Refractive index (nD)
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1.4090 | ||
Hazards | |||
NFPA 704 (fire diamond) | |||
Safety data sheet (SDS) | External MSDS | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Bis(trimethylsilyl)amine (also known as hexamethyldisilazane and HMDS) is an organosilicon compound with the molecular formula [(CH3)3Si]2NH. The molecule is a derivative of ammonia with trimethylsilyl groups in place of two hydrogen atoms. An electron diffraction study shows that silicon-nitrogen bond length (173.5 pm) and Si-N-Si bond angle (125.5°) to be similar to disilazane (in which methyl groups are replaced by hydrogen atoms) suggesting that steric factors are not a factor in regulating angles in this case.[2] This colorless liquid is a reagent and a precursor to bases that are popular in organic synthesis and organometallic chemistry. Additionally, HMDS is also increasingly used as molecular precursor in chemical vapor deposition techniques to deposit silicon carbonitride thin films or coatings.