Login
Login

Sodium selenide

{{Chembox

| Verifiedfields = changed

| Watchedfields = changed

| verifiedrevid = 443953227

| ImageFile1=Na2Se-powder.jpg

| ImageFile2 = Sodium-selenide-unit-cell-1992-CM-3D-balls.png

| ImageSize =

| ImageAlt =

| IUPACName = sodium selenide

| PIN =

| OtherNames =

|Section1={{Chembox Identifiers

| CASNo_Ref = {{cascite|correct|??}}

| CASNo = 1313-85-5

| ChEBI_Ref = {{ebicite|correct|EBI}}

| ChEBI = 77773

| ChemSpiderID = 66601

| EINECS = 215-212-0

| PubChem = 73973

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = 1FEK1K7WCE

| StdInChI = 1S/2Na.Se/q2*+1;-2

| StdInChIKey = VPQBLCVGUWPDHV-UHFFFAOYSA-N

| SMILES = [Na+].[Na+].[Se-2]

}}

|Section2={{Chembox Properties

| Na=2 | Se=1

| Appearance =

| Odor =

| Density = 2.62 g cm−3

| MeltingPt = >875 °C

| MeltingPt_ref={{cite book | editor= Haynes, William M. | date = 2016| title = CRC Handbook of Chemistry and Physics | edition = 97th | publisher = CRC Press | isbn = 9781498754293|page=4.87| title-link = CRC Handbook of Chemistry and Physics}}

| BoilingPt =

| Solubility = reacts with water

}}

|Section3={{Chembox Structure

| Structure_ref ={{cite journal|doi=10.1021/ic00037a027|title=Solid-state metathesis as a quick route to transition-metal mixed dichalcogenides|journal=Inorganic Chemistry|volume=31|issue=11|pages=2127–2132|year=1992|last1=Bonneau|first1=Philippe R.|last2=Jarvis|first2=Robert F.|last3=Kaner|first3=Richard B.}}

| CrystalStruct = Cubic (fluorite), cF12

| SpaceGroup = Fm{{overline|3}}m, No. 225

| LattConst_a = 0.6825 nm

| UnitCellFormulas =4

}}

|Section7={{Chembox Hazards

| GHSPictograms = {{GHS06}} {{GHS08}} {{GHS09}}

| GHSSignalWord = Danger

| HPhrases = {{H-phrases|301|331|373|410}}

| PPhrases = {{P-phrases|260|261|264|270|271|273|301+310|304+340|311|314|321|330|391|403+233|405|501}}

| MainHazards =

| FlashPt =

| AutoignitionPt =

}}

|Section8={{Chembox Related

| OtherAnions = Sodium oxide
Sodium sulfide
Sodium telluride
Sodium polonide

| OtherCations = Hydrogen selenide
Lithium selenide
Potassium selenide
Rubidium selenide
Caesium selenide

| OtherCompounds = Sodium selenite
Sodium selenate
Aluminum selenide
Antimony selenide

}}

}}

Sodium selenide is an inorganic compound of sodium and selenium with the chemical formula Na2Se.

Preparation

This colourless solid is prepared by the reaction of selenium with a solution of sodium in liquid ammonia at −40 °C.Brauer, G. ed. (1963) Handbook of Preparative Inorganic Chemistry, 2nd Ed., Academic Press, NY., Vol. 1. p. 421. Alternatively, sodium selenide can be prepared by the reaction of gaseous hydrogen selenide with metallic sodium at 100 °C.

Reactions

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.

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 Me3XCl → (Me3X)2Se + 2 NaCl (X ∈ Si, Ge, Sn)

References

{{Commons category|Sodium selenide}}

{{reflist}}

{{Sodium compounds}}

{{Selenides}}

Category:Sodium compounds

Category:Selenides

Category:Fluorite crystal structure

{{inorganic-compound-stub}}