| 词条 | Mercury(II) iodide |
| 释义 |
| Verifiedfields = changed | Watchedfields = changed | verifiedrevid = 470454715 | Name = Mercury(II) iodide | ImageFile = Mercury(II)-iodide-xtal-3D-SF-A.png | ImageSize = | ImageCaption = Mercury(II) iodide (α form) | ImageFile1 = Mercury(II)-iodide-xtal-3D-SF-B.png | ImageSize1 = | ImageCaption1 = Mercury(II) iodide (β form) | ImageFile2 = Mercury iodide.jpg | ImageCaption2 = β (left) and α (right) forms | IUPACName = Mercury diiodide | OtherNames = Mercuric iodide Red mercury (α form only) Coccinite |Section1={{Chembox Identifiers | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} | ChemSpiderID = 22893 | UNII_Ref = {{fdacite|correct|FDA}} | UNII = R03O05RB0P | InChI = 1/Hg.2HI/h;2*1H/q+2;;/p-2 | InChIKey = YFDLHELOZYVNJE-NUQVWONBAE | DrugBank_Ref = {{drugbankcite|correct|drugbank}} | DrugBank = DB04445 | ChEBI_Ref = {{ebicite|correct|EBI}} | ChEBI = 49659 | SMILES = I[Hg]I | StdInChI_Ref = {{stdinchicite|correct|chemspider}} | StdInChI = 1S/Hg.2HI/h;2*1H/q+2;;/p-2 | StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} | StdInChIKey = YFDLHELOZYVNJE-UHFFFAOYSA-L | CASNo = 7774-29-0 | CASNo_Ref = {{cascite|correct|CAS}} | PubChem = 24485 |Section2={{Chembox Properties | Formula = HgI2 | MolarMass = 454.40 g/mol | Appearance = orange-red powder | Odor = odorless | Density = 6.36 g/cm3 | Solubility = 0.006 g/100 mL | SolubleOther = slightly soluble in alcohol, ether, acetone, chloroform, ethyl acetate, CS2, olive oil, castor oil | MeltingPtC = 259 | BoilingPtC = 350 | RefractIndex = 2.455 | MagSus = −128.6·10−6 cm3/mol |Section3={{Chembox Structure | CrystalStruct = Tetrahedral |Section6={{Chembox Pharmacology | ATCCode_prefix = D08 | ATCCode_suffix = AK30 }} |Section7={{Chembox Hazards | ExternalSDS = | EUClass = Very toxic (T+) Dangerous for the environment (N) | RPhrases = {{R26/27/28}}, {{R33}}, {{R50/53}} | SPhrases = {{S1/2}}, {{S13}}, {{S28}}, {{S45}}, {{S60}}, {{S61}} | NFPA-H = 3 | NFPA-F = 0 | NFPA-R = 0 | FlashPt = Non-flammable | PEL = |Section8={{Chembox Related | OtherAnions = Mercury(II) fluoride Mercury(II) chloride Mercury(II) bromide | OtherCations = Zinc iodide Cadmium iodide | OtherCompounds = Mercury(I) iodide }} Mercury(II) iodide is a chemical compound with the molecular formula HgI2. It is typically produced synthetically but can also be found in nature as the extremely rare mineral coccinite. Unlike the related mercury(II) chloride it is hardly soluble in water (<100 ppm). ProductionMercury(II) iodide is produced by adding an aqueous solution of potassium iodide to an aqueous solution of mercury(II) chloride with stirring; the precipitate is filtered off, washed and dried at 70 °C. HgCl2 + 2 KI → HgI2 + KCl PropertiesMercury(II) iodide displays thermochromism; when heated above 126 °C (400°K) it undergoes a phase transition, 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 used for thermochromism demonstrations.[1] A third orange form is also known; this can be formed by recrystallisation and is also metastable, eventually converting back to the red alpha form.[2] The various forms can exist in a diverse range of crystal structures and as a result mercury(II) iodide possess a surprisingly complex phase diagram.[3] UsesMercury(II) iodide is used for preparation of Nessler's reagent, used for detection of presence of ammonia. Mercury(II) iodide is a semiconductor material, used in some x-ray and gamma ray detection and imaging devices operating at room temperatures.[4] In veterinary medicine, mercury(II) iodide is used in blister ointments in exostoses, bursal 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
References1. ^Thermochromism: Mercury(II) Iodide. Jchemed.chem.wisc.edu. Retrieved on 2011-06-02. {{Mercury compounds}}{{Antiseptics and disinfectants}}2. ^{{cite journal|last1=SCHWARZENBACH|first1=D.|title=The crystal structure and one-dimensional disorder of the orange modification of HgI2|journal=Zeitschrift für Kristallographie - Crystalline Materials|date=1 January 1969|volume=128|issue=1-6|doi=10.1524/zkri.1969.128.16.97}} 3. ^{{cite journal|last1=Hostettler|first1=Marc|last2=Schwarzenbach|first2=Dieter|title=Phase diagrams and structures of HgX2 (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}} 4. ^Simage, Oy {{US patent|6509203}} Semiconductor imaging device and method for producing same, Issue date: Jan 21, 2003 4 : Iodides|Metal halides|Mercury compounds|Semiconductor materials |
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