![]() Mercury(II) iodide (α form)
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![]() Mercury(II) iodide (β form)
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![]() β (left) and α (right) forms
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Names | |
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IUPAC name
Mercury(II) iodide
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Other names | |
Identifiers | |
3D model (JSmol)
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ChEBI | |
ChemSpider | |
DrugBank | |
ECHA InfoCard | 100.028.976 |
EC Number |
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277788 | |
PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
HgI2 | |
Molar mass | 454.40 g/mol |
Appearance | orange-red powder |
Odor | odorless |
Density | 6.36 g/cm3 |
Melting point | 259 °C (498 °F; 532 K) |
Boiling point | 350 °C (662 °F; 623 K) |
6 mg/100 mL | |
Solubility product (Ksp)
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2.9×10−29[1] |
Solubility | slightly soluble in alcohol, ether, acetone, chloroform, ethyl acetate, CS2, olive oil, castor oil
Soluble in excess KI(Potassium iodide) forming soluble complex K2[Hg2I4 ](Potassium tetraiodomercurate(II)) also known as Nessler's reagent |
−128.6·10−6 cm3/mol | |
Refractive index (nD)
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2.455 |
Structure | |
Tetrahedral | |
Pharmacology | |
D08AK30 (WHO) | |
Hazards | |
GHS labelling: | |
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Danger | |
H300, H310, H330, H373, H410 | |
P260, P262, P264, P270, P271, P273, P280, P284, P301+P310, P302+P350, P304+P340, P310, P314, P320, P321, P322, P330, P361, P363, P391, P403+P233, P405, P501 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Related compounds | |
Other anions
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Mercury(II) fluoride Mercury(II) chloride Mercury(II) bromide |
Other cations
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Zinc iodide Cadmium iodide |
Related compounds
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Mercury(I) iodide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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).