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Revision as of 16:10, 9 January 2012 editBeetstra (talk | contribs)Edit filter managers, Administrators172,084 edits Saving copy of the {{chembox}} taken from revid 468941445 of page Mercury(II)_iodide for the Chem/Drugbox validation project (updated: '').  Latest revision as of 00:14, 20 November 2024 edit 2a02:3100:3e00:2300:c401:77f:3413:b9a9 (talk) revert apparent self-care spam (manual due to bot fixes)Tags: Undo references removed 
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{{ambox | text = This page contains a copy of the infobox ({{tl|chembox}}) taken from revid of page ] with values updated to verified values.}}
{{chembox {{chembox
| Verifiedfields = changed
⚫ | verifiedrevid = 444009597
| Watchedfields = changed
⚫ | verifiedrevid = 470454715
| Name = Mercury(II) iodide | Name = Mercury(II) iodide
| ImageFile = Mercury(II)-iodide-xtal-3D-vdW-A.png | ImageFile = Mercury(II)-iodide-xtal-3D-SF-A.png
| ImageSize = | ImageSize =
| ImageCaption = Mercury(II) iodide (α form) | ImageCaption = Mercury(II) iodide (α form)
| ImageFile1 = Mercury(II)-iodide-xtal-3D-vdW-B.png | ImageFile1 = Mercury(II)-iodide-xtal-3D-SF-B.png
| ImageSize1 = | ImageSize1 =
| ImageCaption1 = Mercury(II) iodide (β form) | ImageCaption1 = Mercury(II) iodide (β form)
| ImageFile2 = Mercury iodide.jpg | ImageFile2 = Mercury iodide.jpg
| ImageCaption2 = α (right) and β (left) forms | ImageCaption2 = β (left) and α (right) forms
| IUPACName = Mercury diiodide | IUPACName = Mercury(II) iodide
| OtherNames = Mercury diiodide<br/>Mercuric iodide<br/>] <small>(α form only)</small><br/>] <small>(α form only)</small>
| OtherNames = Mercuric iodide
| Section1 = {{Chembox Identifiers |Section1={{Chembox Identifiers
| CASNo = 7774-29-0
⚫ | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
⚫ | CASNo_Ref = {{cascite|correct|CAS}}
⚫ | ChEBI_Ref = {{ebicite|correct|EBI}}
⚫ | ChEBI = 49659
⚫ | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 22893 | ChemSpiderID = 22893
⚫ | DrugBank_Ref = {{drugbankcite|correct|drugbank}}
⚫ | DrugBank = DB04445
| EINECS = 231-873-8
| Gmelin = 277788
| UNII_Ref = {{fdacite|correct|FDA}} | UNII_Ref = {{fdacite|correct|FDA}}
| UNII = R03O05RB0P | UNII = R03O05RB0P
| PubChem = 24485
| InChI = 1/Hg.2HI/h;2*1H/q+2;;/p-2 | InChI = 1/Hg.2HI/h;2*1H/q+2;;/p-2
| InChIKey = YFDLHELOZYVNJE-NUQVWONBAE | InChIKey = YFDLHELOZYVNJE-NUQVWONBAE
⚫ | DrugBank_Ref = {{drugbankcite|correct|drugbank}}
⚫ | DrugBank = DB04445
⚫ | ChEBI_Ref = {{ebicite|correct|EBI}}
⚫ | ChEBI = 49659
| SMILES = II
| StdInChI_Ref = {{stdinchicite|correct|chemspider}} | StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/Hg.2HI/h;2*1H/q+2;;/p-2 | StdInChI = 1S/Hg.2HI/h;2*1H/q+2;;/p-2
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} | StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = YFDLHELOZYVNJE-UHFFFAOYSA-L | StdInChIKey = YFDLHELOZYVNJE-UHFFFAOYSA-L
| CASNo = 7774-29-0 | SMILES = II
⚫ | CASNo_Ref = {{cascite|correct|CAS}}
}} }}
| Section2 = {{Chembox Properties |Section2={{Chembox Properties
| Formula = HgI<sub>2</sub> | Formula = HgI<sub>2</sub>
| MolarMass = 454.40 g/mol | MolarMass = 454.40 g/mol
| Appearance = orange-red powder | Appearance = orange-red powder
| Density = 6.36 g/cm<sup>3</sup> | Odor = odorless
| Density = 6.36 g/cm<sup>3</sup>
| Solubility = 0.06 g/L | Solubility = 6 mg/100 mL
| SolubleOther = slightly soluble in ], ], ], ], ], ], ], ]
| MeltingPt = 259 °C

| BoilingPt = 350 °C
Soluble in excess KI(]) forming soluble complex K<sub>2</sub>(]) also known as ]
| SolubilityProduct = 2.9{{e|&minus;29}}<ref name="crc">{{cite book |author1=John Rumble |title=CRC Handbook of Chemistry and Physics |date=June 18, 2018 |publisher=CRC Press |isbn=978-1138561632 |pages=5–189|edition=99 |language=English}}</ref>
| MeltingPtC = 259
| BoilingPtC = 350
| RefractIndex = 2.455
| MagSus = &minus;128.6·10<sup>−6</sup> cm<sup>3</sup>/mol
}} }}
| Section7 = {{Chembox Hazards |Section3={{Chembox Structure
| CrystalStruct = Tetrahedral
| ExternalMSDS =
}}
| EUIndex = 080-002-00-6
|Section6={{Chembox Pharmacology
| EUClass = Very toxic ('''T+''')<br/>Dangerous for the environment ('''N''')
| ATCCode_prefix = D08
| RPhrases = {{R26/27/28}}, {{R33}}, {{R50/53}}
| ATCCode_suffix = AK30
| SPhrases = {{S1/2}}, {{S13}}, {{S28}}, {{S45}}, {{S60}}, {{S61}}
}}
⚫ | NFPA-H = 3
|Section7={{Chembox Hazards
⚫ | NFPA-F = 0
| NFPA-R = 0 | ExternalSDS =
| GHSPictograms = {{GHS06}}{{GHS08}}{{GHS09}}
⚫ | FlashPt = Non-flammable
| PEL = | GHSSignalWord = Danger
| HPhrases = {{H-phrases|300|310|330|373|410}}
| PPhrases = {{P-phrases|260|262|264|270|271|273|280|284|301+310|302+350|304+340|310|314|320|321|322|330|361|363|391|403+233|405|501}}
⚫ | NFPA-H = 3
⚫ | NFPA-F = 0
| NFPA-R = 0
⚫ | FlashPt = Non-flammable
| PEL =
}} }}
| Section8 = {{Chembox Related |Section8={{Chembox Related
| OtherAnions = ]<br/>]<br/>] | OtherAnions = ]<br/>]<br/>]
| OtherCations = ]<br/>] | OtherCations = ]<br/>]
| OtherCpds = ] | OtherCompounds = ]
}} }}
}} }}

'''Mercury(II) iodide''' is a ] with the molecular formula ]]. It is typically produced synthetically but can also be found in nature as the extremely rare mineral ]. Unlike the related ] it is hardly soluble in water (<100 ppm).

==Production==
Mercury(II) iodide is produced by adding an aqueous solution of ] to an aqueous solution of ] with stirring; the precipitate is filtered off, washed and dried at 70&nbsp;°C.

: HgCl<sub>2</sub> + 2 KI → HgI<sub>2</sub> + 2 KCl

==Properties==
Mercury(II) iodide displays ]; when heated above 126&nbsp;°C (400 K) it undergoes a ], from the red alpha crystalline form to a pale yellow beta form. As the sample cools, it gradually reacquires its original colour. It has often been used for ] demonstrations.<ref>. Jchemed.chem.wisc.edu. Retrieved on 2011-06-02.</ref> A third form, which is orange, is also known; this can be formed by recrystallisation and is also ], eventually converting back to the red alpha form.<ref>{{cite journal|last1=SCHWARZENBACH|first1=D.|title=The crystal structure and one-dimensional disorder of the orange modification of HgI<sub>2</sub>|journal=Zeitschrift für Kristallographie - Crystalline Materials|date=1 January 1969|volume=128|issue=1–6|pages=97–114|doi=10.1524/zkri.1969.128.16.97|s2cid=96682743}}</ref> The various forms can exist in a diverse range of crystal structures and as a result mercury(II) iodide possesses a surprisingly complex ].<ref>{{cite journal|last1=Hostettler|first1=Marc|last2=Schwarzenbach|first2=Dieter|title=Phase diagrams and structures of HgX<sub>2</sub> (X = I, Br, Cl, F)|journal=Comptes Rendus Chimie|date=February 2005|volume=8|issue=2|pages=147–156|doi=10.1016/j.crci.2004.06.006|url=https://comptes-rendus.academie-sciences.fr/chimie/articles/10.1016/j.crci.2004.06.006/ }}</ref>

==Uses==
]]]
Mercury(II) iodide is used for preparation of ], used for detection of presence of ].

Mercury(II) iodide is a ], used in some ] and ] detection and imaging devices operating at room temperatures.<ref>Simage, Oy {{US patent|6509203}} Semiconductor imaging device and method for producing same, Issue date: Jan 21, 2003</ref>

In ], mercury(II) iodide is used in ] ]s in ], ] enlargement, etc. {{Citation needed|reason=Reliable source needed for the whole sentence|date=March 2017}}

It can appear as a precipitate in many reactions.

==See also==

*], Hg<sub>2</sub>I<sub>2</sub>

==References==
{{reflist}}

{{Mercury compounds}}
{{Iodides}}
{{Antiseptics and disinfectants}}

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Misplaced Pages:WikiProject Chemicals/Chembox validation/VerifiedDataSandbox and Mercury(II) iodide: Difference between pages Add topic