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	143.890903 g·mol−1
Appearance	Violet brown solid
Density	2.36 g/cm3
Solubility in water	Hydrolysis
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Toxic, releases AsH3
Related compounds
Other anions	Sodium nitride; Sodium phosphide; Sodium antimonide;
Other cations	Lithium arsenide; Calcium arsenide;
	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.^[2] It is a dark colored solid that degrades upon contact with water or air. 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 GPa (520,000 psi), 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.

Synthesis

It is prepared by passing 350–450 °C (662–842 °F) sodium vapor over preheated elemental arsenic in an evacuated tube and removing excess sodium at 450 °C (842 °F) under high vacuum.^[1]

References

^ ^a ^b Dönges, E. (1963). "Alkali Metals". In Brauer, G. (ed.). Handbook of Preparative Inorganic Chemistry. Vol. 1 (2nd ed.). New York, NY: Academic Press. p. 986.
^ Elements, American. "Sodium Arsenide". American Elements. Retrieved 2018-12-05.
^ 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.

[Brauer-1] Dönges, E. (1963). "Alkali Metals". In Brauer, G. (ed.). Handbook of Preparative Inorganic Chemistry. Vol. 1 (2nd ed.). New York, NY: Academic Press. p. 986.

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

[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.

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