Basic lead phosphite
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| IUPACName =
| OtherNames = basic lead phosphonite
|Section1={{Chembox Identifiers
| CASNo = 1344-40-7
| PubChem = 71300865
| UNNumber = 2989
| StdInChI=1S/2HO3P.H2O.4O.6Pb/c2*1-4(2)3;;;;;;;;;;;/h2*1H;1H2;;;;;;;;;;/q2*-2;;;;;;;;;;2*+2
| StdInChIKey = XTQIDVCLCLXOKX-UHFFFAOYSA-N
| SMILES = O.OP([O-])[O-].OP([O-])[O-].O=[Pb].O=[Pb].O=[Pb].O=[Pb].[Pb+2].[Pb+2]
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|Section2={{Chembox Properties
| Pb=3|O=6|H=3|P=1
| MolarMass =
| Appearance = white solid
| Density =
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|Section3={{Chembox Hazards
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|Section7 = {{Chembox Hazards
| GHSPictograms = {{GHS02}}{{GHS08}}
| GHSSignalWord = Danger
| HPhrases = {{H-phrases|228|350|360|370|372}}
| PPhrases = {{P-phrases|201|202|210|240|241|260|264|270|280|281|307+311|308+313|314|321|370+378|405|501}}
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Basic lead phosphite is an inorganic compound with the proposed composition Pb3O(OH)2(HPO3).{{cite journal|journal=Vinyl and Additive Technology|volume=4|year=1998|pages=179–181|title=The structure of lead stabilizers. 2: Basic salts of inorganic acids|first1=Richard F.|last1=Grossman|first2=Dale|last2=Krausnick|issue=3|doi=10.1002/vnl.10038|s2cid=95532627}} The compound contains the phosphite anion, which provides the reducing properties associated with the application of this material.
It is widely used as a stabilizer for chlorine-containing polymers, especially polyvinylchloride.{{Ullmann|doi= 10.1002/14356007.a19_527|title= Phosphorus Compounds, Inorganic|year= 2000|last1= Bettermann|first1= Gerhard|last2= Krause|first2= Werner|last3= Riess|first3= Gerhard|last4= Hofmann|first4= Thomas}}. Other lead phosphites are known, including normal lead phosphite, PbHPO3, although the basic salt is especially effective.{{cite journal|title=Synthesis, crystal structures and properties of lead phosphite compounds|author1=Song, Jun-Ling|author2=Hu, Chun-Li|author3=Xu, Xiang|author4=Kong, Fang|author5=Mao, Jiang-Gao|journal=Journal of Solid State Chemistry|year=2015|volume=231|pages=198–203|doi=10.1016/j.jssc.2015.08.031|bibcode=2015JSSCh.231..198S }}