Tetraiodomercurate(II)

Tetraiodomercurate(II)
Names
Preferred IUPAC name
tetraiodomercurate(II)
Systematic IUPAC name
tetraiodomercury(2-)
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
130791
  • InChI=1S/Hg.4HI/h;4*1H/q+2;;;;/p-4
    Key: RSBGXBMIRUIJTD-UHFFFAOYSA-J
  • I[Hg-2](I)(I)I
Properties
HgI2−4
Molar mass 708.211 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Tetraiodomercurate(II) is an inorganic dianion that is found in potassium tetraiodomercurate(II), as well as various other salts. Tetraiodomercurate(II) has the chemical formula HgI2−4. The central mercury atom in this coordination complex has a +2 oxidation state. Although the complex has tetrahedral molecular geometry, its exact geometry can be influenced by hydrogen bonding to the iodine atoms.

Salts

At room temperature, salts of tetraiodomercurate(II) come in various colors ranging from red to light yellow.

Silver tetraiodomercurate(II) and copper tetraiodomercurate(II), Ag2HgI4 and Cu2HgI4 respectively, can be generated from the precursor potassium tetraiodomercurate(II) and are thermochromic. Its indium, gold, thallium, rubidium, cesium, and lithium salts are not thermochromic.[unreliable source?]

The aqueous solution of its barium salt, barium tetraiodomercurate(II) [de] (BaHgI4), is known as Rohrbach's solution and has historically been used as a heavy liquid.

References

  1. ↑ Terao, Hiromitsu; Gesing, Thorsten M.; Ishihara, Hideta; Furukawa, Yoshihiro; Gowda, B. Thimme (2009). "Bis(guanidinium) tetraiodidomercurate(II)". Acta Crystallographica Section E: Structure Reports Online. 65 (5): m503. doi:10.1107/S160053680901280X. PMC 2977565. PMID 21583751.
  2. 1 2 Jaw, Huey-Rong C.; Mooney, Margaret M.; Novinson, Thomas; Kaska, William C.; Zink, Jeffrey I. (1987-05-01). "Optical properties of the thermochromic compounds Ag2HgI4 and Cu2HgI4". Inorganic Chemistry. 26 (9): 1387–1391. doi:10.1021/ic00256a011. ISSN 0020-1669.
  3. ↑ Raditoiu, Valentin; Radovici, Constantin; Raditoiu, Alina; Nicolae, Cristian Andi; Culita, Daniela Cristina; Fierascu, Radu Claudiu; Amariutei, Viorica; Wagner, Luminita Eugenia (2013-10-01). "Switching behavior of thermochromic copper and silver tetraiodomercurate embedded in silica hybrid materials". Optical Materials. 35 (12): 2565–2572. Bibcode:2013OptMa..35.2565R. doi:10.1016/j.optmat.2013.07.027. ISSN 0925-3467.
  4. ↑ Handbook of Preparative Inorganic Chemistry 1 & 2, Brauer.
  5. ↑ US4832933A, Novinson, Thomas, "Metal tetraiodomercurates as infrared detectors", issued 1989-05-23
  6. ↑ "Inorganic analysis". Analyst. 37 (433): 145–153. 1912-01-01. Bibcode:1912Ana....37..145.. doi:10.1039/AN9123700145. ISSN 1364-5528.
  7. ↑ Dictionary of Chemistry. ISBN 978-0-07-141046-5.