Manganese(II) selenide

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| IUPACName = Manganese(II) selenide

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|Section1={{Chembox Identifiers

| CASNo = 1313-22-0

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| UNII = 8R9E626WPL

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| PubChem = 73970

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| EINECS = 215-203-1

| ChemSpiderID = 66598

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

| InChI = 1S/Mn.Se

| InChIKey = UMUKXUYHMLVFLM-UHFFFAOYSA-N

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|Section2={{Chembox Properties

| Formula = MnSe

| MolarMass = 133.9 g/mol

| Appearance = gray solid

| Odor =

| Density = 5.59 g/cm³ (20 °C)

| MeltingPtC = 1460

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| Solubility = insoluble

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|Section3={{Chembox Structure

| Coordination = Octahedral

| CrystalStruct = cubic, cF8

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

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|Section4={{Chembox Hazards

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| Section8 = {{Chembox Related

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| OtherAnions =Manganese(II) oxide
Manganese(II) sulfide
Manganese(II) telluride

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Manganese(II) selenide is an inorganic compound with the chemical formula MnSe. It is a dense gray solid that dissolves only by reaction.

Manganese(II) selenide can be synthesized by the reaction of selenium powder and manganese(II) acetate in an alkaline solution with a reducing agent such as hydrazine at 180°C.{{Cite journal|last1=Hussain|first1=Raja Azadar|last2=Hussain|first2=Iqtadar|date=2020-11-25|title=Manganese selenide: Synthetic aspects and applications|url=https://www.sciencedirect.com/science/article/pii/S0925838820321642|journal=Journal of Alloys and Compounds|language=en|volume=842|pages=155800|doi=10.1016/j.jallcom.2020.155800|s2cid=219919862 |issn=0925-8388|url-access=subscription}}

Manganese selenide exists in three polymorphs. Most common is the stable α-phase (NaCl type).{{cite journal |doi=10.1002/zaac.19562850107 |title=Über feste Lösungen in den Systemen ZnS/MnS, ZnSe/MnSe und ZnTe/MnTe |date=1956 |last1=Juza |first1=Robert |last2=Rabenau |first2=Albrecht |last3=Pascher |first3=Gertrud |journal=Zeitschrift für Anorganische und Allgemeine Chemie |volume=285 |issue=1–2 |pages=61–69 }} There is also a metastable γ-phase (wurtzite type) and an unstable β phase (zincblende type).