Holmium(III) chloride
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| Names | |
|---|---|
| Other names Holmium trichloride Holmiumchlorid | |
| Identifiers | |
CAS Number |
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| ECHA InfoCard | 100.030.339  |
PubChem CID |
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| UNII |
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CompTox Dashboard (EPA) |
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| Properties | |
Chemical formula | HoCl3 |
| Molar mass | 271.289 g/mol |
| Appearance | yellow crystals hygroscopic |
| Density | 3.7 g/cm3 |
| Melting point | 720 °C (1,328 °F; 993 K)[1] |
| Boiling point | 1,500 °C (2,730 °F; 1,770 K) (decomposes) |
Solubility in water | dissolves |
| Structure | |
Crystal structure | Monoclinic, mS16 |
Space group | C12/m1, No. 12 |
| Related compounds | |
Other anions | Holmium(III) oxide |
Other cations | Dysprosium(III) chloride, Erbium(III) chloride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).  N verify (what is  Y N ?) Infobox references | |
Chemical compound
Holmium(III) chloride is the inorganic compound with the formula HoCl3. It is a common salt but is mainly used in research. It can be used to produce pure holmium.[2] It exhibits the same color-changing behavior seen in holmium oxide, being a yellow in natural lighting and a bright pink color in fluorescent lighting.
Preparation
The most commonly used method to obtain holmium(III) chloride involves heating a mixture of holmium(III) oxide and ammonium chloride at 200-250 °C:[3]
- Ho2O3 + 6 NH4Cl → 2 HoCl3 + 6 NH3 + 2 H2O
The hexahydrate of holmium(III) chloride can be obtained by reaction between holmium and hydrochloric acid:[3]
- 2 Ho + 6 HCl → 2 HoCl3 + 3 H2
It can also be prepared by the direct reaction between holmium and chlorine:[4]
- 2 Ho + 3 Cl2 → 2 HoCl3
Properties
Holmium(III) chloride and its hexahydrate are light yellow solids in daylight that are soluble in water. The hexahydrate starts to release water of crystallization at 64 °C.[5] Holmium(III) chloride has a monoclinic crystal structure analogous to that of aluminum(III) chloride.[3] In the solid state it has the YCl3 layer structure.[6]
References
- ^ Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3.
- ^ Emsley, John (2003). Nature's building blocks: an A-Z guide to the elements (Reprinted with corrections ed.). Oxford: Oxford Univ. Press. ISBN 978-0-19-850340-8.
- ^ a b c Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY.
- ^ Webelements: Holmium
- ^ Ans, Jan d'; Ans, Jan d' (1998). Elemente, anorganische Verbindungen und Materialien. Taschenbuch für Chemiker und Physiker / D'Ans (4., neubearb. u. rev. Aufl ed.). Ort nicht ermittelbar: Verlag nicht ermittelbar. ISBN 978-3-540-60035-0.
- ^ Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford. ISBN 0-19-855370-6
