Polonium sulfide
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| OtherNames = Polonium monosulfide{{cite web |title=polonium {{!}} Definition, Symbol, Properties, Uses, & Facts |url=https://www.britannica.com/science/polonium |website=Encyclopedia Britannica |access-date=2 November 2021 |language=en}}
|Section1={{Chembox Identifiers
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| CASNo = 19268-62-3
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| StdInChI = 1S/Po.S
| StdInChIKey = PKZBITJUBFSEGA-UHFFFAOYSA-N
| SMILES = [Po]=[S]
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|Section2={{Chembox Properties
| Formula = PoS
| MolarMass = 241.07 g/mol
| Appearance = Black crystals
| Density =
| MeltingPtC = 500
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| Solubility = Insoluble{{cite book |last1=Schweitzer |first1=George K. |last2=Pesterfield |first2=Lester L. |title=The Aqueous Chemistry of the Elements |date=14 January 2010 |publisher=Oxford University Press |isbn=978-0-19-539335-4 |page=243 |url=https://books.google.com/books?id=-oI8DwAAQBAJ&dq=Polonium+sulfide+PoS&pg=PA243 |language=en}}
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|Section3={{Chembox Hazards
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|Section6={{Chembox Related
| OtherCompounds = Chromium(III) sulfide
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Polonium sulfide is an inorganic compound of polonium and sulfur with the chemical formula PoS.{{cite book |last1=Macintyre |first1=Jane E. |title=Dictionary of Inorganic Compounds |date=23 July 1992 |publisher=CRC Press |isbn=978-0-412-30120-9 |page=3779 |url=https://books.google.com/books?id=9eJvoNCSCRMC&dq=Polonium+sulfide+PoS&pg=PA3779 |access-date=2 November 2021 |language=en}} The compound is radioactive and forms black crystals.{{cite journal |last1=Sergeevа |first1=V. I. |last2=Stepanova |first2=N. Yu. |last3=Savenko |first3=A. V. |last4=Sapozhnikov |first4=Yu. A. |title=Use of Iron Sulfide for Removing Polonium from Liquid Radioactive Waste |journal=Radiochemistry |date=2015 |volume=57 |issue=5 |pages=534–536 |doi=10.1134/S1066362215050148 |s2cid=59461310 |url=https://istina.msu.ru/download/10702342/1gdyYu:rGRfA8vK1MsZtub1PT_rZq-gIYY/|access-date=2 November 2021|url-access=subscription }}
Synthesis
1. Passing hydrogen sulfide through an acidic solution of a polonium(II) salt:{{cite book |last1=Wiberg |first1=Egon |last2=Holleman |first2=A. F. |last3=Wiberg |first3=Nils |title=Inorganic Chemistry |date=2001 |publisher=Academic Press |isbn=978-0-12-352651-9 |page=594 |url=https://books.google.com/books?id=Mtth5g59dEIC&dq=Polonium+sulfide+PoS&pg=PA594 |access-date=2 November 2021 |language=en}}{{cite book |last1=Considine |first1=Douglas M. |last2=Considine |first2=Glenn D. |title=Van Nostrand's Scientific Encyclopedia |date=11 December 2013 |publisher=Springer Science & Business Media |isbn=978-1-4757-6918-0 |page=2503 |url=https://books.google.com/books?id=t4jjBwAAQBAJ&dq=Polonium+sulfide+PoS&pg=PA2503 |access-date=2 November 2021 |language=en}}
:{{chem2 | PoCl2 + H2S -> PoS + 2 HCl }}
2. Reaction of ammonium sulfide aqueous solution with polonium(II) hydroxide:
:{{chem2 | (NH4)2S + Po(OH)2 -> 2 NH3 + 2 H2O + PoS }}
Physical properties
Polonium sulfide forms black solid crystals, insoluble in water, ammonium sulfide, ethanol, acetone, or toluene.
Chemical properties
Polonium sulfide has strong reducing properties and can be oxidized by chlorine water, bromine water, sodium hypochlorite, and aqua regia. Polonium sulfide is also unstable to heating. It decomposes into elemental polonium and elemental sulfur when heated to 274.85°C in a vacuum:{{cite book |last1=Brown |first1=Susan A. |last2=Brown |first2=Paul L. |title=The Aqueous Chemistry of Polonium and the Practical Application of its Thermochemistry |date=25 September 2019 |publisher=Elsevier |isbn=978-0-12-819309-9 |page=10 |url=https://books.google.com/books?id=eTqvDwAAQBAJ&dq=Polonium+sulfide+PoS&pg=PA10 |access-date=2 November 2021 |language=en}}
:{{chem2 | PoS -> Po + S }}
Reacts with concentrated acids:
:{{chem2 | PoS + 2 HCl -> PoCl2 + H2S }}
Applications
Used in the isolation and purification of polonium.{{Citation needed|date=November 2024}}