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Mercury(II) iodide

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Mercury(II) iodide
Mercury(II) iodide (α form)
Mercury(II) iodide (β form)
Names
IUPAC name
Mercury diiodide
Other names
Mercuric iodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.028.976 Edit this at Wikidata
UNII
  • InChI=1S/Hg.2HI/h;2*1H/q+2;;/p-2 checkY
    Key: YFDLHELOZYVNJE-UHFFFAOYSA-L checkY
  • InChI=1/Hg.2HI/h;2*1H/q+2;;/p-2
    Key: YFDLHELOZYVNJE-NUQVWONBAE
  • I[Hg]I
Properties
HgI2
Molar mass 454.40 g/mol
Appearance scarlet red powder
Density 6.36 g/cm3
Melting point 259 °C
Boiling point 350 °C
0.006g/100 ml
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
3
0
0
Flash point Non-flammable
Related compounds
Other anions
 Mercury(II) fluoride
Mercury(II) chloride
Mercury(II) bromide
Other cations
 Zinc iodide
Cadmium iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Mercury(II) iodide (HgI2) is a chemical compound with an appearance of red-orange crystals. Unlike mercury(II) chloride it is hardly soluble in water (<100 ppm).

Conditions/substances to avoid include: heat, light, bromides, chlorides, ammonia, alkalis, cyanides, copper salts, lead salts, iodoform and hydrogen peroxide.

Mercury(II) iodide displays thermochromism; when heated above 126 °C, it undergoes phase transition from the alpha crystalline form to a pale yellow beta form. As the sample cools, it gradually reacquires its original color. It is often used for thermochromism demonstrations.[1]

Mercury(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.[2]

Mercury(II) iodide can be found extremely rarely in nature as mineral coccinite.

In medicine, mercury(II) iodide was formerly used as a treatment for syphilis (see Protiodide).

In veterinary medicine, mercury(II) iodide is used in blister ointments in exostoses, bursal enlargement, etc.

It can appear as a precipitate in many reactions.

References

  1. ^ http://jchemed.chem.wisc.edu/JCESoft/CCA/CCA2/MAIN/THERMHG/CD2R1.HTM
  2. ^ http://www.freepatentsonline.com/6509203.html


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