Sodium arsenide

Sodium arsenide
Names
IUPAC name
Disodioarsanylsodium
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.762 Edit this at Wikidata
EC Number
  • 234-952-5
  • InChI=1S/As.3Na
    Key: MMQSOEGXVXPNSH-UHFFFAOYSA-N
  • [Na][As]([Na])[Na]
Properties
Na3As
Molar mass 143.89 g·mol−1
Appearance Violet brown solid
Density 2.36 g·cm−3
Hydrolysis
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Toxic, releases AsH3
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).

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).
  1. ^ Elements, American. "Sodium Arsenide". American Elements. Retrieved 2018-12-05.
  2. ^ E. Dönges (1963). G. Brauer (ed.). Alkali Metals (2nd ed.). New York: Academic Press. p. 986. {{cite book}}: |work= ignored (help)
  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.