Caesium dichloroiodate
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 Caesium dichloroiodate on a lab spatula
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| Names | |
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| IUPAC name
Caesium dichloroiodate(I)
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| Other names
Cesium dichloroiodide
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| Identifiers | |
3D model (JSmol)
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| E number | Lua error in Module:Wikidata at line 879: attempt to index field 'wikibase' (a nil value). |
PubChem CID
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CompTox Dashboard (EPA)
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| Properties[4] | |
| Cl2CsI | |
| Molar mass | 330.71 g·mol−1 |
| Appearance | trigonal crystals[1] |
| Density | 3.86 (20°C, g/cm3) |
| Melting point | 139 °C (decomposes)[2] |
| carbon tetrachloride: 0.00126 (25°C), water: soluble, ethanol: soluble[3] | |
| Hazards | |
| GHS pictograms | 
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| GHS Signal word | |
| <abbr class="abbr" title="Error in hazard statements">HH315, <abbr class="abbr" title="Error in hazard statements">HH319, <abbr class="abbr" title="Error in hazard statements">HH335 | |
| <abbr class="abbr" title="Error in hazard statements">PP261, <abbr class="abbr" title="Error in hazard statements">PP264, <abbr class="abbr" title="Error in hazard statements">PP265, <abbr class="abbr" title="Error in hazard statements">PP271, <abbr class="abbr" title="Error in hazard statements">PP280, <abbr class="abbr" title="Error in hazard statements">PP302+P352, <abbr class="abbr" title="Error in hazard statements">PP304+P340, <abbr class="abbr" title="Error in hazard statements">PP305+P351+P338, <abbr class="abbr" title="Error in hazard statements">PP319, <abbr class="abbr" title="Error in hazard statements">PP321, <abbr class="abbr" title="Error in hazard statements">PP332+P317, <abbr class="abbr" title="Error in hazard statements">PP337+P317, <abbr class="abbr" title="Error in hazard statements">PP362+P364, <abbr class="abbr" title="Error in hazard statements">PP403+P233, <abbr class="abbr" title="Error in hazard statements">PP405, <abbr class="abbr" title="Error in hazard statements">PP501 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Caesium dichloroiodate is an inorganic compound with the formula Cs(ICl2). This yellow-orange salt is a crystalline solid in its pure form at room temperature. Fractional crystallization of caesium dichloroiodate may be used to separate caesium from rubidium.[6][7][8][9]
Chemical and Physical Properties
Iodide compounds are soluble in water, however, iodide-rich solutions act as better dissolution agents for creating iodide solutions.[10] Caesium dichloroiodate readily dissolves in room temperature water, forming a dark yellow-orange solution. This color is due to the production of free iodine via the hydrolysis of caesium dichloroiodate to elemental iodine, hydrochloric acid, and caesium ions. Such hydrolysis also occurs on contact with normal air, which contains moisture.
Caesium dichloroiodate may be synthesized via the reaction of caesium chloride (acidified using hydrochloric acid) with iodine monochloride. Thermolysis (ending at 450–500 °C) recovers the starting materials.[8]
Chemical Hazards
Caesium dichloroiodate is known to cause moderate to severe respiratory irritation through single exposure. It also causes skin and eye irritation through similar single exposure.[5] In humid air, it may release ICl, or Cl2, which may also pose a hazard. The biological activity of cesium dichloroiodate has not been extensively studied, however it is important to note that compounds containing cesium and iodine can exhibit toxic effects. For instance, exposure to cesium salts may lead to skin and eye irritation, as previously mentioned. The specific toxicity of cesium dichloroiodate has been categorized under regulatory classifications indicating potential hazards.[11]
References
- ↑ Jain, Anubhav; Ong, Shyue Ping; Hautier, Geoffroy; Chen, Wei; Richards, William Davidson; Dacek, Stephen; Cholia, Shreyas; Gunter, Dan; Skinner, David; Ceder, Gerbrand; Persson, Kristin A. (2013-07-01). "Commentary: The Materials Project: A materials genome approach to accelerating materials innovation". APL Materials. 1 (1). doi:10.1063/1.4812323. ISSN 2166-532X.
- ↑ Harris, G.S.; McKechnie, J.S. (January 1982). "Thermogravimetric analysis and dissociation pressure of caesium trihalides". Polyhedron. 1 (2): 215–216. doi:10.1016/S0277-5387(00)80991-2.
- ↑ Справочник экспериментальных данных по растворимости солевых систем. - Т. 3. - Л.: ГНТИХЛ, 1961 pp. 2186 [Russian], Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983 [Russian], Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983 [Russian] (Respectively)
- ↑ "cesium dichloroiodate(I)". chemister.ru. Retrieved 2025-07-31.
- ↑ 5.0 5.1 PubChem. "Cesium dichloroiodate". pubchem.ncbi.nlm.nih.gov. Retrieved 2025-07-31.
- ↑ Baxter, Gregory Paul; Thomas, Joseph Smith (May 1934). "A Revision of the Atomic Weight of Cesium". Journal of the American Chemical Society. 56 (5): 1108–1110. doi:10.1021/ja01320a030.
- ↑ Ishibashi, Masayoshi; Yamamoto, Toshio; Hara, Tadashi (1959). "On the Purification of Cesium Chloride". Bulletin of the Institute for Chemical Research, Kyoto University. hdl:2433/75692.
- ↑ 8.0 8.1 Simons, E.L.; Cairns, E.J.; Sangermano, L.D. (February 1966). "Purification and preparation of some caesium compounds". Talanta. 13 (2): 199–204. doi:10.1016/0039-9140(66)80026-7.
- ↑ Niu, Heyue; Yu, Mingming; Mubula, Yusufujiang; Zeng, Ling; Xu, Kun; Zhu, Zhehan; He, Guichun (18 July 2025). "Extraction of Rubidium and Cesium from a Variety of Resources: A Review". Materials. 18 (14). doi:10.3390/ma18143378. Unknown parameter
|article-number=ignored (help) - ↑ "Cesium Dichloroiodate | CAS 15605-42-2 | Cl2CsI | AMERICAN ELEMENTS ®". www.americanelements.com. Retrieved 2025-07-31.
- ↑ "Substance Information - ECHA". echa.europa.eu. Retrieved 2025-07-31.
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