Holmium(III) chloride

Names
Other names

Holmium trichloride
Holmiumchlorid

Identifiers

CAS Number

* 10138-62-2 Y
* 14914-84-2 (hexahydrate) Y

PubChem CID

* 24992

UNII |

* CAR334HOLD Y

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 YN ?)
Infobox references

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

1. ↑ Lide, David R., ed (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3.
2. ↑ 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.
3. ↑ 3.0 3.1 3.2 Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY.
4. ↑ Webelements: Holmium
5. ↑ 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.
6. ↑ Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford. ISBN 0-19-855370-6

* v
* t
* e

Holmium compounds

* HoBr3
* HoCl3
* Ho2O3
* Ho2Ti2O7

* v
* t
* e

Salts and covalent derivatives of the chloride ion

HCl |  |  |  | He

|
|
|
|

LiCl | BeCl2 | BCl3
B2Cl4 | CCl4 | NCl3
ClN3 | Cl2O
ClO2
Cl2O7 | ClF
ClF3
ClF5 | Ne
NaCl | MgCl2 | AlCl
AlCl3 | SiCl4 | P2Cl4
PCl3
PCl5 | S2Cl2
SCl2
SCl4 | Cl2 | Ar
KCl | CaCl
CaCl2 | ScCl3 | TiCl2
TiCl3
TiCl4 | VCl2
VCl3
VCl4
VCl5 | CrCl2
CrCl3
CrCl4 | MnCl2 | FeCl2
FeCl3 | CoCl2
CoCl3 | NiCl2 | CuCl
CuCl2 | ZnCl2 | GaCl2
GaCl3 | GeCl2
GeCl4 | AsCl3
AsCl5 | Se2Cl2
SeCl4 | BrCl | KrCl
RbCl | SrCl2 | YCl3 | ZrCl3
ZrCl4 | NbCl4
NbCl5 | MoCl2
MoCl3
MoCl4
MoCl5
MoCl6 | TcCl4 | RuCl3 | RhCl3 | PdCl2 | AgCl | CdCl2 | InCl
InCl2
InCl3 | SnCl2
SnCl4 | SbCl3
SbCl5 | Te3Cl2
TeCl4 | ICl
ICl3 | XeCl
XeCl2
CsCl | BaCl2 |  | HfCl4 | TaCl5 | WCl2
WCl3
WCl4
WCl5
WCl6 | Re3Cl9
ReCl4
ReCl5
ReCl6 | OsCl4 | IrCl2
IrCl3
IrCl4 | PtCl2
PtCl4 | AuCl
AuCl3 | Hg2Cl2,
HgCl2 | TlCl | PbCl2,
PbCl4 | BiCl3 | PoCl2,
PoCl4 | AtCl  | RnCl2
FrCl | RaCl2 |  | Rf  | Db  | Sg  | Bh  | Hs  | Mt  | Ds  | Rg  | Cn  | Nh  | Fl  | Mc  | Lv  | Ts  | Og
| ↓  |  |
LaCl3 | CeCl3 | PrCl3 | NdCl2,
NdCl3 | PmCl3 | SmCl2,
SmCl3 | EuCl2,
EuCl3 | GdCl3 | TbCl3 | DyCl2,
DyCl3 | HoCl3 | ErCl3 | TmCl2
TmCl3 | YbCl2
YbCl3 | LuCl3
AcCl3 | ThCl4 | PaCl5 | UCl3
UCl4
UCl5
UCl6 | NpCl4 | PuCl3 | AmCl2
AmCl3 | CmCl3 | BkCl3 | CfCl3 | EsCl3 | Fm  | Md  | No  | LrCl3

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