Sodium arsenide

Sodium arsenide
Names
	IUPAC name Disodioarsanylsodium
Identifiers
CAS Number	12044-25-6;
3D model (JSmol)	Interactive image;
ChemSpider	74787;
ECHA InfoCard	100.031.762
EC Number	234-952-5;
PubChem CID	82879;
CompTox Dashboard (EPA)	DTXSID0065222 ;
	InChI InChI=1S/As.3Na Key: MMQSOEGXVXPNSH-UHFFFAOYSA-N;
	SMILES [Na][As]([Na])[Na];
Properties
Chemical formula	Na3As
Molar mass	143.89 g·mol−1
Appearance	Violet brown solid
Density	2.36 g·cm−3
Solubility in water	Hydrolysis
Hazards
Main hazards	Toxic
Related compounds
Other anions	Sodium nitride, sodium phosphide, sodium antimonide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Sodium arsenide, also known as trisodium arsenide, is the inorganic compound of sodium and arsenic with the formula Na₃As.[1] It is a dark colored solid that degrades upon contact with water or air. It is prepared by the reaction of the elements at 200–400 °C.[2] The compound is mainly of interest as exhibiting an archetypal structure. The normal pressure "sodium arsenide" phase is adopted by many alkali metal pnictides. At 3.6 gigapascals, Na₃As adopts the Li₃Bi structure, which is another archetypal structure.[3] Sodium arsenide is a crystalline solid used as a semiconductor and in photo optic applications. Its IUPAC name is disodioarsanylsodium.

At high pressures, Na₃As adopts this cubic structure (the so-called Li₃Bi motif).

References

Elements, American. "Sodium Arsenide". American Elements. Retrieved 2018-12-05.
E. Dönges (1963). G. Brauer (ed.). Alkali Metals. Handbook of Preparative Inorganic Chemistry (2nd ed.). New York: Academic Press. p. 986.
Beister, Heinz Jürgen; Syassen, Karl; Klein, Jürgen (1990). "Phase Transition of Na3As under Pressure". Zeitschrift für Naturforschung B. 45 (10): 1388–1392. doi:10.1515/znb-1990-1007. S2CID 197037185.

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[1] Elements, American. "Sodium Arsenide". American Elements. Retrieved 2018-12-05.

[2] E. Dönges (1963). G. Brauer (ed.). Alkali Metals. Handbook of Preparative Inorganic Chemistry (2nd ed.). New York: Academic Press. p. 986.

[3] Beister, Heinz Jürgen; Syassen, Karl; Klein, Jürgen (1990). "Phase Transition of Na3As under Pressure". Zeitschrift für Naturforschung B. 45 (10): 1388–1392. doi:10.1515/znb-1990-1007. S2CID 197037185.