Potassium phosphide

Crystal structure
__ K +      __ P 3−
General
Surname	Potassium phosphide
other names	Tripotassium phosphide
Ratio formula	K 3 P
Brief description	green solid
External identifiers / databases
CAS number 20770-41-6 EC number 244-021-5 ECHA InfoCard 100.040.004 PubChem 22182308 Wikidata Q15725553
properties
Molar mass	148.27 g mol −1
Physical state	firmly
density	1.75 g cm −3
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Potassium phosphide is an inorganic chemical compound of potassium from the group of phosphides .

Extraction and presentation

Potassium phosphide can be obtained by reacting potassium with phosphorus under argon at 200 ° C.

${\displaystyle \mathrm {3\ K+P\longrightarrow K_{3}P} }$

properties

Potassium phosphide is an extremely air-sensitive green solid with a hexagonal crystal structure ( space group P 6 ₃ / mmc (space group no. 194) , lattice parameters a = 5.691 Å and b = 10.05 Å). It reacts violently with water. The structure contains two crystallographically different potassium ions. The first is trigonal-planar surrounded by three phosphide ions, the second tetrahedral .

Individual evidence

1. ↑ ^{a b c d e} Georg Brauer (Ed.), With the collaboration of Marianne Baudler u. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 960.
2. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
3. ↑ G. Gnutzmann, FW Dorn, W. Klemm: The behavior of alkali metals to semimetals. VII. About some A ₃ B and AB ₂ compounds of the heavy alkali metals with elements of the V group. In: Journal for inorganic and general chemistry , 309, 1961, pp. 210-225, doi: 10.1002 / zaac.19613090308 .
4. ↑ NOAA: POTASSIUM PHOSPHIDE | CAMEO Chemicals , accessed April 10, 2014.