|Jmol-3D images||Image 1|
|Molar mass||124.94 g mol−1|
|Density||2.62 g cm−3|
|Melting point||>875 °C|
|Solubility in water||reacts with water|
|Other anions||Sodium sulfide
|Other cations||Hydrogen selenide
|Related compounds||Sodium selenite
|Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)|
|(what is: / ?)|
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. 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.
- Na2Se + H2O → NaHSe + NaOH
Similarly, sodium selenide is readily oxidized to polyselenides, a conversion signaled by off-white samples.
- 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
- Na2Se + 2 Me3ECl → (Me3E)2Se + 2 NaCl (E = Si, Ge, Sn)
Sodium selenide should be stored and handled away from moisture and air.
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