|Preferred IUPAC name
Potassium bis(trimethylsilyl)amide
Potassium hexamethyldisilazide
3D model (Jmol)
|Molar mass||199.4831 g mol−1|
|Appearance||White, opaque crystals|
|GHS signal word||DANGER|
|P280, P305+351+338, P310|
EU classification (DSD)
|S-phrases||S26, S36/37/39, S43, S45|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Potassium bis(trimethylsilyl)amide (commonly abbreviated as KHMDS, Potassium(K) HexaMethylDiSilazide) is the chemical compound with the formula ((CH3)3Si)2NK. It is a strong, non-nucleophilic base with an approximate pKa of 26 (compare to lithium diisopropylamide, at 36).
In the solid state, the unsolvated compound is dimeric, with two potassium and two nitrogen atoms forming a square. This compound is soluble in hydrocarbon solvents and conducts electricity poorly in solution and in the melt. This is attributed to very strong ion pairing.
- Potassium bis(trimethylsilyl)amide, Sigma-Aldrich
- Tesh, Kris F.; Hanusa, Timothy P.; Huffman, John C. (1990). "Ion pairing in [bis(trimethylsilyl)amido]potassium: The x-ray crystal structure of unsolvated [KN(SiMe3)2]2". Inorg. Chem. 29 (8): 1584–1586. doi:10.1021/ic00333a029.
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