Holmium(III) sulfate

Holmium(III) sulfate

Names
Other names Holmium sulfate
Identifiers
CAS Number	15622-40-9 octahyddrate: 13473-57-9
3D model (JSmol)	Interactive image monohydrate: Interactive image octahyddrate: Interactive image
ChemSpider	146390 monohydrate: 21242007 octahyddrate: 32818082
ECHA InfoCard	100.036.073
EC Number	239-697-3 octahyddrate:630-442-5
PubChem CID	167320 monohydrate: 25021756 octahyddrate: 57348038
CompTox Dashboard (EPA)	DTXSID60890762 octahyddrate: DTXSID90721555
InChI InChI=1S/2Ho.3H2O4S/c;;3*1-5(2,3)4/h;;3*(H2,1,2,3,4)/q2*+3;;;/p-6 Key: MKPJADFELTTXAV-UHFFFAOYSA-H monohydrate:InChI=1S/2Ho.3H2O4S.H2O/c;;3*1-5(2,3)4;/h;;3*(H2,1,2,3,4);1H2/q2*+3;;;;/p-6 Key: NTBVQHGZWAVKKD-UHFFFAOYSA-H octahyddrate:InChI=1S/2Ho.3H2O4S.8H2O/c;;3*1-5(2,3)4;;;;;;;;/h;;3*(H2,1,2,3,4);8*1H2/q2*+3;;;;;;;;;;;/p-6 Key: BGUKVZHPVQVULL-UHFFFAOYSA-H
SMILES [O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[Ho+3].[Ho+3] monohydrate:O.O=S(=O)([O-])[O-].O=S(=O)([O-])[O-].O=S(=O)([O-])[O-].[Ho+3].[Ho+3] octahyddrate:O.O.O.O.O.O.O.O.O=S(=O)([O-])[O-].O=S(=O)([O-])[O-].O=S(=O)([O-])[O-].[Ho+3].[Ho+3]
Properties
Chemical formula	Ho2(SO4)3
Molar mass	618.03 g·mol−1
Appearance	Orange-yellow solid [1]
Density	1.031 g/cm3 [2]
Solubility in water	45.56 g/L (25 °C) [2] 14.77 g/L (95 °C) [2]
Hazards
GHS labelling: [3]
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Holmium(III) sulfate is a holmium compound with the chemical formula Ho₂(SO₄)₃. A hygroscopic orange-yellow octahydrate exists. ^{[1] [4]}

Preparation

Holmium(III) sulfate can be prepared by dissolving holmium(III) oxide in sulfuric acid: ^[1]

Ho₂O₃ + 3 H₂SO₄ → Ho₂(SO₄)₃ + 3 H₂O

Adding triethylamine produces a 1-D amine templated holmium(III) sulfate material. ^[5]

Reactions

Holmium(III) sulfate reacts with hydrogen sulfide to form holmium(III) sulfide at elevated temperatures. ^[6]

Holmium(III) sulfate is a catalyst for orthohydrogen-parahydrogen conversion at cryogenic temperatures. ^[7]

A holmium-silver sulfate (AgHo(SO₄)₂) can be synthesized from holmium(III) sulfate and silver sulfate: ^[8]

Ag₂SO₄ + Ho₂(SO₄)₃ → 2AgHo(SO₄)₂

References

1. Wickleder, Mathias S. (1998-10-01). "Synthesis, Crystal Structure, and Thermal Behavior of the Rare Earth Sulfates (H₅O₂)M(SO₄)₂ (M = Ho, Er, Y)" . Chemistry of Materials. 10 (10): 3212–3216. doi:10.1021/cm980301w. ISSN   0897-4756.
2. Judge, W. D.; Ng, K. L.; Moldoveanu, G. A.; Kolliopoulos, G.; Papangelakis, V. G.; Azimi, G. (2023-04-01). "Solubilities of heavy rare earth sulfates in water (gadolinium to lutetium) and H2SO4 solutions (dysprosium)". Hydrometallurgy. 218 106054: 3. doi:10.1016/j.hydromet.2023.106054. ISSN   0304-386X.
3. PubChem. "Sulfuric acid, holmium(3+) salt (3:2)". pubchem.ncbi.nlm.nih.gov. Retrieved 2026-01-22.
4. Perry, Dale L. (2016-04-19). Handbook of Inorganic Compounds. CRC Press. p. 198. ISBN   978-1-4398-1462-8.
5. Zhou, Wanli; Chen, Qi; Jiang, Ning; Meng, Xiang; Zhu, Dunru; Xu, Yan (2009). "Solvothermal synthesis, crystal structure and properties of a novel 1-D organic amine templated holmium sulfate". Inorganica Chimica Acta. 362 (9). Elsevier BV: 3299–3302. doi:10.1016/j.ica.2009.02.042. ISSN   0020-1693.
6. K. Wetzel (1963). "Lanthanum Sulfides". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 2. NY, NY: Academic Press. p. 1153.
7. Davidson, Eric; Chang, Tiao-hsu; Chapin, Douglas S. (2002-05-01). "Surface Catalysis of the Orthohydrogen—Parahydrogen Conversion on Carbon-Supported Gadolinium and Holmium Sulfates at 77°K Using Ultrahigh-Vacuum Techniques". The Journal of Physical Chemistry. 70 (2): 347–351. doi:10.1021/j100874a005 . Retrieved 2026-01-22.
8. Denisenko, Yuriy G.; Atuchin, Victor V.; Molokeev, Maxim S.; Wang, Naizheng; Jiang, Xingxing; Aleksandrovsky, Aleksandr S.; Krylov, Alexander S.; Oreshonkov, Aleksandr S.; Sedykh, Alexander E.; Volkova, Svetlana S.; Lin, Zheshuai; Andreev, Oleg V.; Müller-Buschbaum, Klaus (2021-06-20). "Negative thermal expansion in one-dimension of a new double sulfate AgHo(SO4)2 with isolated SO4 tetrahedra". Journal of Materials Science & Technology. 76: 111–121. doi:10.1016/j.jmst.2020.10.026. ISSN   1005-0302.