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| Verifiedfields = changed |
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| verifiedrevid = 417347998 |
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| Name = Holmium(III) chloride |
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| verifiedrevid = 439252335 |
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| OtherNames = Holmium trichloride, Holmiumchlorid |
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| Name = Holmium(III) chloride |
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| OtherNames = Holmium trichloride<br/>Holmiumchlorid |
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| ImageFile = Aluminium-trichloride-crystal-3D-balls.png |
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| ImageFile = Aluminium-trichloride-crystal-3D-balls.png |
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| Section1 = {{Chembox Identifiers |
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|Section1={{Chembox Identifiers |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| CASNo = 10138-62-2 |
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| CASNo = 10138-62-2 |
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| CASOther = <br> 14914-84-2 (hexahydrate) |
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| CASNo2_Ref = {{cascite|correct|CAS}} |
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| CASNo2 = 14914-84-2 |
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| CASNo2_Comment = (hexahydrate) |
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| UNII_Ref = {{fdacite|correct|FDA}} |
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| UNII = CAR334HOLD |
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| PubChem = 24992 |
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| Section2 = {{Chembox Properties |
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|Section2={{Chembox Properties |
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| Formula = HoCl<sub>3</sub> |
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| Formula = HoCl<sub>3</sub> |
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| Appearance = yellow crystals <br> ] |
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| Appearance = yellow crystals <br> ] |
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| Density = 3.7 g/cm<sup>3</sup> |
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| Density = 3.7 g/cm<sup>3</sup> |
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| MolarMass = 271.20 g/mol |
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| MolarMass = 271.289 g/mol |
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| Solubility = dissolves |
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| Solubility = dissolves |
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| MeltingPtC = 720 |
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| MeltingPt = 720 °C<ref>{{RubberBible87th}}</ref> |
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| MeltingPt_ref = <ref>{{RubberBible87th}}</ref> |
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| BoilingPt = 1500 °C (decomp) |
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| BoilingPtC = 1500 |
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| BoilingPt_notes = (decomposes) |
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| Section3 = {{Chembox Structure |
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|Section3={{Chembox Structure |
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| CrystalStruct = ], ] |
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| CrystalStruct = ], ] |
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| SpaceGroup = C12/m1, No. 12 |
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| SpaceGroup = C12/m1, No. 12 |
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| Section7 = {{Chembox Hazards |
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|Section8={{Chembox Related |
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| OtherAnions = ] |
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| OtherCations = ], ] |
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'''Holmium(III) chloride''' is the ] with the ] ]]. It is a common salt but is mainly used in research. It exhibits the same color-changing behavior seen in ], being a yellow in natural lighting and a bright pink color in fluorescent lighting. |
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'''Holmium(III) chloride''' is the ] with the ] ]]. It is a common salt but is mainly used in research. It can be used to produce pure holmium.<ref>{{Cite book |last=Emsley |first=John |title=Nature's building blocks: an A-Z guide to the elements |date=2003 |publisher=Oxford Univ. Press |isbn=978-0-19-850340-8 |edition=Reprinted with corrections |location=Oxford}}</ref> It exhibits the same color-changing behavior seen in ], being a yellow in natural lighting and a bright pink color in fluorescent lighting. |
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==Preparation== |
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==Preparation== |
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It forms upon union of the elements, but a more commonly used method involves heating a mixture of ] and ] at 200-250 °C:<ref name=Brauer>Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY.</ref> |
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The most commonly used method to obtain holmium(III) chloride involves heating a mixture of ] and ] at 200-250 °C:<ref name=Brauer>Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY.</ref> |
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:Ho<sub>2</sub>O<sub>3</sub> + 6 NH<sub>4</sub>Cl → 2 HoCl<sub>3</sub> + 6 NH<sub>3</sub> + 2 H<sub>2</sub>O |
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: Ho<sub>2</sub>O<sub>3</sub> + 6 NH<sub>4</sub>Cl → 2 HoCl<sub>3</sub> + 6 NH<sub>3</sub> + 2 H<sub>2</sub>O |
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The hexahydrate of holmium(III) chloride can be obtained by reaction between holmium and ]:<ref name=Brauer /> |
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: 2 Ho + 6 HCl → 2 HoCl<sub>3</sub> + 3 H<sub>2</sub> |
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It can also be prepared by the direct reaction between holmium and ]:<ref>Webelements: </ref> |
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: 2 Ho + 3 Cl<sub>2</sub> → 2 HoCl<sub>3</sub> |
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==Structure== |
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==Properties== |
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In the solid state it has the ] layer structure. <ref> Wells A.F. (1984) ''Structural Inorganic Chemistry'' 5th edition Oxford. ISBN 0-19-855370-6 </ref> |
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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.<ref>{{Cite book |last=Ans |first=Jan d' |title=Elemente, anorganische Verbindungen und Materialien |last2=Ans |first2=Jan d' |date=1998 |publisher=Verlag nicht ermittelbar |isbn=978-3-540-60035-0 |edition=4., neubearb. u. rev. Aufl |series=Taschenbuch für Chemiker und Physiker / D'Ans |location=Ort nicht ermittelbar}}</ref> Holmium(III) chloride has a monoclinic crystal structure analogous to that of aluminum(III) chloride.<ref name=Brauer /> In the solid state it has the ] layer structure.<ref>Wells A.F. (1984) ''Structural Inorganic Chemistry'' 5th edition Oxford. {{ISBN|0-19-855370-6}}</ref> |
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==References== |
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==References== |
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{{Reflist}} |
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{{Reflist}} |
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{{inorganic-compound-stub}} |
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{{Holmium compounds}} |
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{{Holmium compounds}} |
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{{Chlorides}} |
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{{Lanthanide halides}} |
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] |
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] |
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] |
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] |
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] |