Sodium selenide

Sodium selenide
Names
	IUPAC name sodium selenide
Identifiers
CAS Number	1313-85-5 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.013.830
EC Number	215-212-0;
PubChem CID	73973;
CompTox Dashboard (EPA)	DTXSID5061661 ;
	InChI InChI=1S/2Na.Se/q2*+1;-2;
	SMILES [Na+].[Na+].[Se-2];
Properties
Chemical formula	Na2Se
Molar mass	124.951 g·mol−1
Appearance	white solid
Density	2.62 g cm−3
Melting point	>875 °C
Solubility in water	reacts with water
Related compounds
Other anions	Sodium sulfide; Sodium telluride; Sodium oxide
Other cations	Hydrogen selenide ; Antimony selenide ; Aluminum selenide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Sodium selenide is an inorganic compound of sodium and selenium with the chemical formula Na₂Se. This colourless solid is prepared by the reaction of selenium with a solution of sodium in ammonia.^[2] Like other alkali metal chalcogenides, this material is highly sensitive to water, easily undergoing hydrolysis to give mixtures of sodium biselenide (NaSeH) and hydroxide. This hydrolysis occurs because of the extreme basicity of the Se^2- ion.

Na₂Se + H₂O → NaHSe + NaOH

Similarly, sodium selenide is readily oxidized to polyselenides, a conversion signaled by off-white samples.

Sodium selenide reacts with acids to produce toxic hydrogen selenide gas.

Na₂Se + 2 HCl → H₂Se + 2 NaCl

The compound reacts with electrophiles to produce the selenium compounds. With alkyl halides, one obtains a variety of organoselenium compounds:

Na₂Se + 2 RBr → R₂Se + 2 NaBr

Organotin and organosilicon halides react similarly to give the expected derivatives:

Na₂Se + 2 Me₃ECl → (Me₃E)₂Se + 2 NaCl (E = Si, Ge, Sn)

Safety

Sodium selenide should be stored and handled away from moisture and air.

References

^ David R. Lide (ed.). CRC Handbook of Chemistry and Physics (90th ed.). ISBN 978-1-4200-9084-0.
^ Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 421.

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[CRC-1] David R. Lide (ed.). CRC Handbook of Chemistry and Physics (90th ed.). ISBN 978-1-4200-9084-0.

[2] Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 421.

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