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Hexamethyl Disilazane (hmds / Hmdz)

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By Author: connex
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Hexamethyl Disilazane (HMDS / HMDZ): Applications, Properties, and Chemistry
Hexamethyl disilazane—commonly known as HMDS or HMDZ—is an important organosilicon compound that serves diverse roles in chemical synthesis, analytical laboratories, industrial processing, and electronic manufacturing. Here, we'll delve into its chemistry, key properties, and broad spectrum of applications.
What Is Hexamethyl Disilazane?
HMDS is an organosilicon compound with the chemical formula [(CH₃)₃Si]₂NH. It presents as a clear, colorless liquid with a pungent, ammonia-like odor. Structurally, HMDS is derived from ammonia, where two hydrogen atoms are replaced with trimethylsilyl groups. This gives HMDS unique properties of volatility and hydrophobicity, which underlie its widespread industrial utility.
Key Chemical Properties
Molecular Formula: C₆H₁₉NSi₂
Molecular Weight: 161.4g/mol
Physical Appearance: Clear, colorless liquid
Odor: Ammonia-like
Hydrophobicity: High
Stability: Stable in absence of moisture, acids, and oxidizers.
HMDS is flammable with a low minimum ignition energy (

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