Misplaced Pages

Potassium amide

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
Potassium amide
Structural formula of potassium amide
Names
IUPAC name Potassium amide
Other names Potassamide
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.037.508 Edit this at Wikidata
EC Number
  • 241-275-9
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/K.H2N/h;1H2/q+1;-1Key: FEMRXDWBWXQOGV-UHFFFAOYSA-N
  • InChI=1/K.H2N/h;1H2/q+1;-1Key: FEMRXDWBWXQOGV-UHFFFAOYAQ
SMILES
  • .
Properties
Chemical formula KNH2
Molar mass 55.121 g·mol
Appearance white solid
Odor ammonia-like
Density 1.57 g/cm
Melting point 338 °C (640 °F; 611 K)
Solubility in water reacts
Solubility ammonia: 3.6 g/(100 mL)
Thermochemistry
Std enthalpy of
formation (ΔfH298) 		-128.9 kJ/mol
Related compounds
Other cations Lithium amide
Sodium amide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). ☒N verify (what is  ?) Infobox references
Chemical compound

Potassium amide is an inorganic compound with the chemical formula KNH2. Like other alkali metal amides, it is a white solid that hydrolyzes readily. It is a strong base.

Production

Potassium amide is produced by the reaction of ammonia with potassium. The reaction typically requires a catalyst.

Structure

Traditionally KNH2 is viewed as a simple salt, but it has significant covalent character and is highly aggregated in ammonia solution. The compound has been characterized by X-ray crystallography as the solvent-free form as well as the mono- and diammonia solvates. In KNH2·2NH3, the potassium centers are each bonded to two amido ligands and four ammonia ligands, all six of which bridge to adjacent potassium centers. The result is a chain of hexacoordinate potassium ions. The K–NH2 distances are 2.7652(11) whereas the K–NH3 distances are respectively 2.9234(11) and 3.0698(11) Å.

References

  1. Takaki, Katherine S. (2001). "Potassium Amide". Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rp193. ISBN 0471936235.
  2. O. Glemser, H. Sauer (1963). "Silver Amide". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 1. NY, NY: Academic Press. p. 1043.
  3. Juza, R.; Jacobs, H.; Klose, W. (1965). "Die Kristallstrukturen der Tieftemperaturmodifikationen von Kalium- und Rubidiumamid". Zeitschrift für Anorganische und Allgemeine Chemie. 338 (3–4): 171–178. doi:10.1002/zaac.19653380309.
  4. Kraus, Florian; Korber, Nikolaus (2005). "Hydrogen Bonds in Potassium Amide-Ammonia(1/2), KNH22NH3". Zeitschrift für Anorganische und Allgemeine Chemie. 631 (6–7): 1032–1034. doi:10.1002/zaac.200400467.
Potassium compounds
H, (pseudo)halogens
chalcogens
pnictogens
B, C group
transition metals
organic


Stub icon

This inorganic compound–related article is a stub. You can help Misplaced Pages by expanding it.

Categories: