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Holmium acetate

Names
Other names Holmium(III) acetate
Identifiers
CAS Number	25519-09-9 anhydrous
3D model (JSmol)	Interactive image
ECHA InfoCard	100.042.773
PubChem CID	4152420
CompTox Dashboard (EPA)	DTXSID00890802
InChI InChI=1S/3C2H4O2.Ho/c3*1-2(3)4;/h3*1H3,(H,3,4);Key: NKWMPWXATGULJJ-UHFFFAOYSA-N
SMILES CC(=O)O.CC(=O)O.CC(=O)O.
Properties
Chemical formula	Ho(CH3COO)3
Appearance	crystals
Solubility in water	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 , 100 kPa). Infobox references

Holmium acetate is the acetate salt of holmium, with a chemical formula of Ho(CH₃COO)₃ as well as at least one hydrate.

Preparation

Holmium acetate can be obtained by dissolving holmium oxide in hot acetic acid

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): The anhydrous material can be obtained by heating the hydrated acetate in acetic acid.

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.

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. In a second polymorph, holmium acetate has 8-coordination. A tetrahydrate has also been crystallized.

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.

References

1. ^ Lossin, Adalbert; Meyer, Gerd (1994). "Pr(CH₃COO)₃, ein wasserfreies Selten-Erd-Acetat mit Netzwerkstruktur". Zeitschrift für Anorganische und Allgemeine Chemie. 620 (3). doi:10.1002/zaac.19946200306.
2. ^ Lossin, Adalbert; Meyer, Gerd (1993). "Wasserfreie Selten-Erd-Acetate, M(CH₃COO)₃ (M = Sm-Lu, Y) mit Kettenstruktur. Kristallstrukturen von Lu(CH₃COO)₃ und Ho(CH₃COO)₃". Zeitschrift für Anorganische und Allgemeine Chemie. 619 (9). doi:10.1002/zaac.19936190917.
3. Anna Mondry, Krystyna Bukietyńska (1991-08-01). "Spectral intensities of holmium acetate single crystals". Inorganica Chimica Acta. 186 (1): 135–138. doi:10.1016/S0020-1693(00)87943-8. ISSN 0020-1693.
4. G. A. M. Hussein, B. A. A. Balboul, G. A. H. Mekhemer (2000-11-01). "Holmium oxide from holmium acetate, formation and characterization: thermoanalytical studies". Journal of Analytical and Applied Pyrolysis. 56 (2): 263–272. Bibcode:2000JAAP...56..263H. doi:10.1016/S0165-2370(00)00100-5. ISSN 0165-2370.{{cite journal}}: CS1 maint: multiple names: authors list (link)
5. . doi:10.1107/S0567740879005987. {{cite journal}}: Cite journal requires |journal= (help); Missing or empty |title= (help)
6. "Holmium acetate". Retrieved 2014-01-01.

External reading

• R. S. Kolat, J. E. Powell (1962-05-01). "Acetate Complexes of the Rare Earth and Several Transition Metal Ions". Inorganic Chemistry. 1 (2): 293–296. doi:10.1021/ic50002a019. ISSN 0020-1669.

• Holmium compounds
• Acetates