Editing Lead(II) iodide (section)

{{Chembox
| Verifiedfields = changed
| Watchedfields = changed
| verifiedrevid = 451315615
| ImageFile = Lead-diiodide-3D-polyhedra.png
| ImageName = Lead(II) iodide
| ImageFile1 = Lead_iodide.jpg
| IUPACName =
| OtherNames = Plumbous iodide
|Section1={{Chembox Identifiers
| CASNo = 10101-63-0
| CASNo_Ref = {{cascite|correct|CAS}}
| PubChem = 24931
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 23305
| EINECS = 233-256-9
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = OTL90F2GLT
| UNNumber = 2291 3077
| InChI = 1/2HI.Pb/h2*1H;/q;;+2/p-2
| InChIKey = RQQRAHKHDFPBMC-NUQVWONBAP
| SMILES = I[Pb]I
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/2HI.Pb/h2*1H;/q;;+2/p-2
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = RQQRAHKHDFPBMC-UHFFFAOYSA-L
 }}
|Section2={{Chembox Properties
| Formula = {{chem|Pb|I|2}}
| MolarMass = 461.01 g/mol
| Appearance = bright yellow powder
| Odor = odorless
| Density = 6.16 g/cm<sup>3</sup>{{sfnp|Haynes|2016|p=4.69}}
| Solubility = {{ubl|0.44 g/L (0 °C) | 0.76 g/L (20 °C){{sfnp|Haynes|2016|p=4.69}}<ref>{{Cite journal |last1=Clever |first1=H. L. |last2=Johnston |first2=F. J. |date=1980 |title=The Solubility of Some Sparingly Soluble Lead Salts: An Evaluation of the Solubility in Water and Aqueous Electrolyte Solution |url=https://www.nist.gov/data/PDFfiles/jpcrd166.pdf |url-status=dead |journal=J. Phys. Chem. |series=Ref. Data (NIST data review) |volume=9 |issue=3 |pages=751–784 |bibcode=1980JPCRD...9..751C |doi=10.1063/1.555628 |archive-url=https://web.archive.org/web/20140211021914/https://www.nist.gov/data/PDFfiles/jpcrd166.pdf |archive-date=2014-02-11 |access-date=2017-07-13}}</ref> | 4.1 g/L (100 °C){{sfnp|Haynes|2016|p=5.171}}<ref name="patnaik" />}}
| SolubilityProduct = 4.41{{e|−9}} (20 °C)
| SolubleOther = {{ubl|insoluble in [[ethanol]],{{sfnp|Haynes|2016|p=4.69}} cold [[hydrochloric acid|HCl]] | soluble in [[alkali]]s, [[potassium iodide|K<span style="font-family:serif;">I</span>]] solution, [[methyl isopropyl ketone]]<ref name="west" />}}
| MeltingPtC = 410
| MeltingPt_ref={{sfnp|Haynes|2016|p=4.69}}
| BoilingPtC = 872
| BoilingPt_notes=decomp.{{sfnp|Haynes|2016|p=4.69}}
| BandGap = 2.34 eV (direct)<ref>{{Cite journal |last1=Ahuja |first1=R. |last2=Arwin |first2=H. |last3=Ferreira Da Silva |first3=A. |last4=Persson |first4=C. |last5=Osorio-Guillén |first5=J. M. |last6=Souza De Almeida |first6=J. |last7=Moyses Araujo |first7=C. |last8=Veje |first8=E. |last9=Veissid |first9=N. |last10=An |first10=C. Y. |last11=Pepe |first11=I. |last12=Johansson |first12=B. |date=2002 |title=Electronic and optical properties of lead iodide |journal=Journal of Applied Physics |volume=92 |issue=12 |pages=7219–7224 |bibcode=2002JAP....92.7219A |doi=10.1063/1.1523145 |s2cid=29398039 |hdl-access=free |hdl=10495/11556}}</ref><ref>{{Cite journal |last1=Zhong |first1=Mianzeng |last2=Zhang |first2=Shuai |last3=Huang |first3=Le |last4=You |first4=Jingbi |last5=Wei |first5=Zhongming |last6=Liu |first6=Xinfeng |last7=Li |first7=Jingbo |date=2017 |title=Large-scale 2D PbI<sub>2</sub> monolayers: experimental realization and their indirect band-gap related properties |journal=Nanoscale |volume=9 |issue=11 |pages=3736–3741 |doi=10.1039/c6nr07924e |pmid=28102404}}</ref>
| MagSus = &minus;126.5·10<sup>−6</sup> cm<sup>3</sup>/mol{{sfnp|Haynes|2016|p=4.128}}
 }}
|Section3={{Chembox Structure
| Structure_ref =<ref name=str>{{Cite journal |last1=Brixner |first1=L.H. |last2=Chen |first2=H.-Y. |last3=Foris |first3=C.M. |date=1981 |title=X-ray study of the PbCl<sub>2−x</sub>I<sub>x</sub> and PbBr<sub>2−x</sub>I<sub>x</sub> systems |journal=Journal of Solid State Chemistry |volume=40 |issue=3 |pages=336–343 |bibcode=1981JSSCh..40..336B |doi=10.1016/0022-4596(81)90400-X}}</ref>
| Coordination = octahedral
| CrystalStruct = [[Hexagonal]] [[Pearson symbol|hP6]]
| SpaceGroup = P6<sub>3</sub>mc, No. 186
| LattConst_a = 0.4556 nm
| LattConst_b = 0.4556 nm
| LattConst_c = 1.3973 nm
| LattConst_alpha = 
| LattConst_beta = 
| LattConst_gamma = 120°
| LattConst_ref =
| LattConst_Comment = 
| UnitCellVolume = 
| UnitCellFormulas = 2
 }}
| Section4 = {{Chembox Thermochemistry
| Thermochemistry_ref ={{sfnp|Haynes|2016|p=5.24}}
| HeatCapacity = 77.4 J/(mol·K)
| Entropy = 174.9 J/(mol·K)
| DeltaHform = −175.5 kJ/mol
| DeltaGfree = −173.6 kJ/mol
| DeltaHcombust =
| DeltaHfus =
| DeltaHvap =
| DeltaHsublim =
 }}
|Section7={{Chembox Hazards
| ExternalSDS =
| GHSPictograms = {{GHS07}}{{GHS08}}{{GHS09}}
| GHSSignalWord = Danger
| HPhrases = {{H-phrases|302|332|360|373|410}}
| PPhrases = {{P-phrases|201|202|260|261|264|270|271|273|281|301+312|304+312|304+340|308+313|312|314|330|391|405|501}}
| NFPA-H = 3
| NFPA-F = 0
| NFPA-R = 0
| NFPA-S =
| FlashPt = Non-flammable
 }}
|Section8={{Chembox Related
| OtherAnions = {{ubl|[[Lead(II) fluoride]] | [[Lead(II) chloride]] | [[Lead(II) bromide]]}}
| OtherCations = [[Tin(II) iodide]]
| OtherCompounds = {{ubl|[[Thallium(I) iodide]] | [[Bismuth(III) iodide]]}}
 }}
}}

'''Lead(II) iodide''' (or '''lead iodide''') is a chemical compound with the formula {{chem|Pb|I|2}}. At [[room temperature]], it is a bright yellow odorless [[crystal]]line solid, that becomes orange and red when heated.<ref name="sigma" /> It was formerly called '''plumbous iodide'''.

The compound currently has a few specialized applications, such as the manufacture of [[solar cells]],<ref name=Dhiaputra/> [[X-ray]]s and [[gamma rays|gamma-ray]] detectors.<ref name=Shah/> Its preparation is an entertaining and popular demonstration in [[chemistry]] education, to teach topics such as [[precipitation reaction]]s and [[stoichiometry]].<ref name="anthony" /> It is [[photolysis|decomposed by light]] at temperatures above {{convert|125|C|F}}, and this effect has been used in a patented [[photography|photographic]] process.<ref name="patnaik" /><ref name="patphot" />

Lead iodide was formerly employed as a yellow pigment in some paints, with the name '''iodide yellow'''. However, that use has been largely discontinued due to its toxicity and poor stability.<ref name=Eastaugh/>