- Mercury(I) iodide
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Mercury(I) iodide Mercury(I) iodideOther namesMercurous iodideIdentifiers CAS number 15385-57-6 Properties Molecular formula Hg2I2 Molar mass 654.98g mol-1 Appearance yellow powder[1] Density 7.7 g cm-3[2] Melting point 140 ˚C (Sublimes)
Solubility in water Slightly soluble in water, insoluble in alcohol Hazards R-phrases R26/27/28, R33, R50/53 S-phrases (S1/2), S13, S28, S45, S60, S61 Main hazards Toxic, corrosive iodide (verify) (what is:
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)Infobox references Mercury(I) iodide is a chemical compound of mercury and iodine. The chemical formula is Hg2I2. It is photosensitive and decomposes easily to mercury and HgI2.
Contents
Synthesis
Mercury(I) iodide can be prepared by direct combination of mercury and iodine:
2 Hg + I2 → Hg2I2
Structure
In common with other Hg(I) (mercurous) compounds which contain linear X-Hg-Hg-X units, Hg2I2 contains linear IHg2I units with an Hg-Hg bond length of 272 pm (Hg-Hg in the metal is 300 pm) and an Hg-I bond length of 268 pm.[3] The overall coordination of each Hg atom is octahedral as it has in addition to the two nearest neighbours there are four other I atoms at 351 pm. [3]The compound is often formulated as Hg22+ 2I−.[4]
Uses
Mercury(I) iodide, called Protiodide, was used as a medicine in early years. However, due to the high toxicity of the substance, it is no longer used.
See also
- Mercury(II) iodide, HgI2
References
- ^ MaTecK GmbH
- ^ WebElements Periodic Table of the Elements
- ^ a b Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications ISBN 0-19-855370-6
- ^ Cotton, F. Albert; Wilkinson, Geoffrey; Murillo, Carlos A.; Bochmann, Manfred (1999), Advanced Inorganic Chemistry (6th ed.), New York: Wiley-Interscience, ISBN 0-471-19957-5
Mercury compounds Categories:- Mercury compounds
- Iodides
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