Sodium selenide

Sodium selenide

Names
IUPAC name sodium selenide
Identifiers
CAS Number	1313-85-5 Y
3D model (Jmol)	Interactive image
ChEBI	CHEBI:77773 N
ECHA InfoCard	100.013.830
EC Number	215-212-0
PubChem	73973
InChI InChI=1S/2Na.Se/q2*+1;-2
SMILES [Na+].[Na+].[Se-2]
Properties
Chemical formula	Na2Se
Molar mass	124.95 g·mol−1
Appearance	white to red solid
Odor	unpleaseant
Density	2.625 g cm−3
Melting point	875 °C (1,607 °F; 1,148 K)
Solubility in water	reacts with water
Structure
Crystal structure	cubic
Thermochemistry
Std molar entropy (So298)	105 J/mol K
Std enthalpy of formation (ΔfHo298)	-343 kJ/mol
Related compounds
Other anions	Sodium sulfide Sodium telluride Sodium oxide
Other cations	Hydrogen selenide Antimony selenide Aluminum selenide
Related compounds	Sodium selenite Sodium selenate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
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 liquid ammonia at -40 °C.

Alternatively, sodium selenide can be prepared by the reaction of gaseous hydrogen selenide with metallic sodium at 100 °C.

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 Se²⁻ ion.

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.

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

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

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