Potassium bis(trimethylsilyl)amide
| Potassium bis(trimethylsilyl)amide | |
|---|---|
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amide_unsolvated_from_crystal.png) | |
| Potassium bis(trimethylsilyl)amide[citation needed] | |
| Other names Potassium hexamethyldisilazide[citation needed] | |
| Identifiers | |
| Abbreviations | KHMDS |
| CAS number | 40949-94-8  |
| PubChem | 3251421 |
| ChemSpider | 21171158  |
| UN number | 3263 |
| Jmol-3D images | {{#if:C[Si](C)(C)N([K])[Si](C)(C)C|Image 1 |
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| Properties | |
| Molecular formula | KSi 2C 6NH 18 |
| Molar mass | 199.4831 g mol-1 |
| Appearance | White, opaque crystals |
| Solubility in water | Reacts |
| Hazards | |
| GHS pictograms |  |
| GHS signal word | DANGER |
| GHS hazard statements | H314[1] |
| GHS precautionary statements | P280, P305+351+338, P310[1] |
| EU classification |  C[1] |
| R-phrases | R14, R34[1] |
| S-phrases | S26, S36/37/39, S43, S45[1] |
| Related compounds | |
| Other cations | Lithium bis(trimethylsilyl)amide |
| (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 | |
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).[citation needed]
Structure
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.[2]
See also
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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.