Tetraiodomercurate(II)
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| Names | |
|---|---|
| Preferred IUPAC name
tetraiodomercurate(II) | |
| Systematic IUPAC name
tetraiodomercury(2-) | |
| Identifiers | |
3D model (JSmol) |
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| ChEBI | |
| ChemSpider | |
| 130791 | |
PubChem CID |
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| 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).
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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.[1]
Salts
[edit]At room temperature, salts of tetraiodomercurate(II) come in various colors ranging from red to light yellow.[2]
Silver tetraiodomercurate(II) and copper tetraiodomercurate(II), Ag2HgI4 and Cu2HgI4 respectively, can be generated from the precursor potassium tetraiodomercurate(II) and are thermochromic.[3][2][4] Its indium, gold, thallium, rubidium, cesium, and lithium salts are not thermochromic.[5][unreliable source?]
The aqueous solution of its barium salt, barium tetraiodomercurate(II) (BaHgI4), is known as Rohrbach's solution and has historically been used as a heavy liquid.[6][7]
A sample of silver tetraiodomercurate(II)![A sample of copper tetraiodomercurate(II) [de]](https://upload.wikimedia.org/wikipedia/commons/thumb/4/49/Cu2HgI4.png/120px-Cu2HgI4.png)
A sample of copper tetraiodomercurate(II)
![A sample of copper tetraiodomercurate(II) [de]](/restyle/wiki/File:Cu2HgI4.png){kind=small}
References
[edit]- ↑ 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.
- 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.
- ↑ 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.
- ↑ Handbook of Preparative Inorganic Chemistry 1 & 2, Brauer.
- ↑ US4832933A, Novinson, Thomas, "Metal tetraiodomercurates as infrared detectors", issued 1989-05-23
- ↑ "Inorganic analysis". Analyst. 37 (433): 145–153. 1912-01-01. Bibcode:1912Ana....37..145.. doi:10.1039/AN9123700145. ISSN 1364-5528.
- ↑ Dictionary of Chemistry. ISBN 978-0-07-141046-5.