Holmium acetate
Compound of holmium
From Wikipedia, the free encyclopedia
Holmium acetate is the acetate salt of holmium, with a chemical formula of Ho(CH3COO)3[1] as well as at least one hydrate.
_acetate.jpg)
| |
| Names | |
|---|---|
| Other names
Holmium(III) acetate | |
| Identifiers | |
| |
3D model (JSmol) |
|
| ChemSpider | |
| ECHA InfoCard | 100.042.773 |
| EC Number |
|
PubChem CID |
|
CompTox Dashboard (EPA) |
|
| |
| |
| Properties | |
| Ho(CH3COO)3 | |
| Appearance | crystals |
| soluble | |
| Related compounds | |
Other anions |
Holmium oxide Holmium hydroxide |
Other cations |
Dysprosium acetate Erbium acetate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
| |
Preparation
Holmium acetate can be obtained by dissolving holmium oxide in hot acetic acid[2]
- Ho2O3 + 6 CH3CO2H → 2 Ho(O2CH3)3 + 3 H2O
Dissolving holmium oxide in acetic acid at a pH of 4 will form the tetrahydrate of holmium acetate (Ho2(CH3COO)6·4H2O):[3] The anhydrous material can be obtained by heating the hydrated acetate in acetic acid.[1]
Physical properties and structure
Holmium acetate hemihepthydate decomposes at 105 °C, forming into a hemihydrate, further decomposing at 135 °C into an anhydride. Further adding heat will form Ho(OH)(CH3COO)2, HoO(CH3COO) then Ho2O2CO3, forming holmium oxide at 590 °C.[4]
According to X-ray crystallography, anhydrous holmium acetate is a coordination polymer. Each Ho(III) center is nine-coordinate, with two bidentate acetate ligands and the remaining sites occupied by oxygens provided by bridging acetate ligands. The lanthanum and praseodymium compounds are isostructural.[1] In a second polymorph, holmium acetate has 8-coordination.[2] A tetrahydrate has also been crystallized.[5]
Applications
Holmium acetate is used in the manufacture of ceramics, glass, phosphors, metal halide lamps, and as a dopant in garnet lasers. It is also used in nuclear reactors to keep the chain reaction in check.[6]