Holmium acetate

Holmium acetate
Names
	Other names Holmium(III) acetate
Identifiers
CAS Number	25519-09-9 anhydrous;
3D model (JSmol)	Interactive image;
ChemSpider	147291;
EC Number	247-066-9;
PubChem CID	168384;
	InChI InChI=1S/3C2H4O2.Ho/c31-2(3)4;/h31H3,(H,3,4);/q;;;+3/p-3 Key: HWQRVFRWLQGBFV-UHFFFAOYSA-K;
	SMILES CC(=O)[O-].CC(=O)[O-].CC(=O)[O-].[Ho+3];
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

Short description: Compound of holmium

Holmium acetate is the acetate salt of holmium, with a chemical formula of Ho(CH₃COO)₃^[1] as well as at least one hydrate.

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]

References

↑ ^1.0 ^1.1 ^1.2 Lossin, Adalbert; Meyer, Gerd (1994). "Pr(CH₃COO)₃, ein wasserfreies Selten-Erd-Acetat mit Netzwerkstruktur". Zeitschrift für Anorganische und Allgemeine Chemie 620 (3): 438–443. doi:10.1002/zaac.19946200306.
↑ ^2.0 ^2.1 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): 1609–1615. doi:10.1002/zaac.19936190917.
↑ 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. Bibcode: 2000JAAP...56..263H.
↑ Bats, J. W.; Kalus, R.; Fuess, H. (1979). "Holmium triacetate tetrahydrate". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry 35 (5): 1225–1227. doi:10.1107/S0567740879005987. Bibcode: 1979AcCrB..35.1225B.
↑ "Holmium acetate". http://www.metall.com.cn/hoac.htm.

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.

v t e Acetyl halides and salts of the acetate ion
AcOH																	He
LiOAc	Be(OAc)₂ BeAcOH											B(OAc)₃	AcOAc ROAc	NH₄OAc	AcOOH	FAc	Ne
NaOAc	Mg(OAc)₂											Al(OAc)₃ ALSOL Al(OAc)₂OH Al₂SO₄(OAc)₄	Si	P	S	ClAc	Ar
KOAc	Ca(OAc)₂	Sc(OAc)₃	Ti(OAc)₄	VO(OAc)₃	Cr(OAc)₂ Cr(OAc)₃	Mn(OAc)₂ Mn(OAc)₃	Fe(OAc)₂ Fe(OAc)₃	Co(OAc)₂, Co(OAc)₃	Ni(OAc)₂	Cu(OAc)₂	Zn(OAc)₂	Ga(OAc)₃	Ge	As(OAc)₃	Se	BrAc	Kr
RbOAc	Sr(OAc)₂	Y(OAc)₃	Zr(OAc)₄	Nb	Mo(OAc)₂	Tc	Ru(OAc)₂ Ru(OAc)₃ Ru(OAc)₄	Rh₂(OAc)₄	Pd(OAc)₂	AgOAc	Cd(OAc)₂	In	Sn(OAc)₂ Sn(OAc)₄	Sb(OAc)₃	Te	IAc	Xe
CsOAc	Ba(OAc)₂		Hf	Ta	W	Re	Os	Ir	Pt(OAc)₂	Au	Hg₂(OAc)₂, Hg(OAc)₂	TlOAc Tl(OAc)₃	Pb(OAc)₂ Pb(OAc)₄	Bi(OAc)₃	Po	At	Rn
Fr	Ra		Rf	Db	Sg	Bh	Hs	Mt	Ds	Rg	Cn	Nh	Fl	Mc	Lv	Ts	Og
		↓
		La(OAc)₃	Ce(OAc)_x	Pr	Nd	Pm	Sm(OAc)₃	Eu(OAc)₃	Gd(OAc)₃	Tb	Dy(OAc)₃	Ho(OAc)₃	Er	Tm	Yb(OAc)₃	Lu(OAc)₃
		Ac	Th	Pa	UO₂(OAc)₂	Np	Pu	Am	Cm	Bk	Cf	Es	Fm	Md	No	Lr

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Original source: https://en.wikipedia.org/wiki/Holmium acetate. Read more

[Meyer-1] 1.0 ^1.1 ^1.2 Lossin, Adalbert; Meyer, Gerd (1994). "Pr(CH₃COO)₃, ein wasserfreies Selten-Erd-Acetat mit Netzwerkstruktur". Zeitschrift für Anorganische und Allgemeine Chemie 620 (3): 438–443. doi:10.1002/zaac.19946200306.

[Meyer2-2] 2.0 ^2.1 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): 1609–1615. 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. doi:10.1016/S0165-2370(00)00100-5. ISSN 0165-2370. Bibcode: 2000JAAP...56..263H.

[5] Bats, J. W.; Kalus, R.; Fuess, H. (1979). "Holmium triacetate tetrahydrate". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry 35 (5): 1225–1227. doi:10.1107/S0567740879005987. Bibcode: 1979AcCrB..35.1225B.

[metall-6] "Holmium acetate". http://www.metall.com.cn/hoac.htm.

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