Holmium acetate

Holmium acetate
Names
	Other names Holmium(III) acetate
Identifiers
CAS Number	25519-09-9 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.042.773
PubChem CID	4152420;
CompTox Dashboard (EPA)	DTXSID00890802 ;
	InChI InChI=1S/3C2H4O2.Ho/c31-2(3)4;/h31H3,(H,3,4); Key: NKWMPWXATGULJJ-UHFFFAOYSA-N;
	SMILES CC(=O)O.CC(=O)O.CC(=O)O.[Ho];
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 [77 °F], 100 kPa). Infobox references

Holmium acetate is the acetate salt of holmium, with a chemical formula of Ho(CH₃COO)₃.

Preparation

Holmium acetate can be obtained by dissolving holmium carbonate in acetic acid: ^[1]

Ho₂(CO₃)₃ + 6 CH₃COOH → 2 (CH₃COO)₃Ho + 3 H₂O + 3 CO₂↑

Dissolving holmium oxide in acetic acid at a pH of 4 will form the tetrahydrate of holmium acetate (Ho₂(CH₃COO)₆·4H₂O):^[2]

Ho₂O₃ + 6 CH₃COOH → 2 Ho(CH₃COO)₃ + 3 H₂O

Physical properties

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.^[3]

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.^[4]

References

^ Chen, Jiayun; Yu, Zhicun; Jiang, Xin; Xu, Jianwen. 醋酸钬晶体的制作方法 (lit. Preparation of holmium acetate crystals). CN 103360234A. 2012
^ 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.
^ 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. doi:10.1016/S0165-2370(00)00100-5. ISSN 0165-2370.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ "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.

[1] Chen, Jiayun; Yu, Zhicun; Jiang, Xin; Xu, Jianwen. 醋酸钬晶体的制作方法 (lit. Preparation of holmium acetate crystals). CN 103360234A. 2012

[2] 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.

[3] 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. doi:10.1016/S0165-2370(00)00100-5. ISSN 0165-2370.{{cite journal}}: CS1 maint: multiple names: authors list (link)

[metall-4] "Holmium acetate". Retrieved 2014-01-01.

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