Chemistry:Strontium phosphide

Strontium phosphide

Names
Other names Tristrontium diphosphide
Identifiers
CAS Number	12504-16-4
3D model (JSmol)	Interactive image
ChemSpider	145854
EC Number	235-678-9
PubChem CID	166710
UN number	2013
InChI InChI=1S/2P.3Sr/q2*-3;3*+2 Key: ATAJSUOOOWSVGL-UHFFFAOYSA-N
SMILES [P-3].[P-3].[Sr+2].[Sr+2].[Sr+2]
Properties
Chemical formula	P2Sr3
Molar mass	324.8
Appearance	Black crystalline material
Density	2.68 g/cm3
Solubility in water	Decomposes in water
Structure
Crystal structure	cubic
Related compounds
Other anions	Calcium phosphide Barium phosphide
Other cations	Strontium nitride Strontium arsenide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Strontium phosphide is an inorganic compound of strontium and phosphorus with the chemical formula Sr₃P₂. The compound looks like black crystalline material.

Synthesis

Heating strontium phosphate with soot in an arc furnace:

$\mathrm{S}\mathrm{r}{\phantom{A}}_3(\mathrm{P}\mathrm{O}{\phantom{A}}_4){\phantom{A}}_2+8\mathrm{C}⟶\mathrm{S}\mathrm{r}{\phantom{A}}_3\mathrm{P}{\phantom{A}}_2+8\mathrm{C}\mathrm{O}$

Reaction of strontium with red phosphorus at high temperature:

$6\mathrm{S}\mathrm{r}+\mathrm{P}{\phantom{A}}_4⟶2\mathrm{S}\mathrm{r}{\phantom{A}}_3\mathrm{P}{\phantom{A}}_2$

Physical properties

Strontium phosphide forms black crystals.

Thermally stable, melts at high temperatures.

Dangerous when wet, poison.

Chemical properties

Decomposes with water releasing phosphine:

$\mathrm{S}\mathrm{r}{\phantom{A}}_3\mathrm{P}{\phantom{A}}_2+2\mathrm{H}{\phantom{A}}_2\mathrm{O}⟶3\mathrm{S}\mathrm{r}(\mathrm{O}\mathrm{H}){\phantom{A}}_2+2\mathrm{P}\mathrm{H}{\phantom{A}}_3$

Reacts with acids:

$\mathrm{S}\mathrm{r}{\phantom{A}}_3\mathrm{P}{\phantom{A}}_2+6\mathrm{H}\mathrm{C}\mathrm{l}⟶3\mathrm{S}\mathrm{r}\mathrm{C}\mathrm{l}{\phantom{A}}_2+2\mathrm{P}\mathrm{H}{\phantom{A}}_3$

Uses

It is a highly reactive substance used as a reagent and in the manufacture of chemically reactive devices.