Terbium(III) sulfate

Chemical compound From Wikipedia, the free encyclopedia

Terbium(III) sulfate is an inorganic compound with the chemical formula Tb2(SO4)3. It is a colorless solid, forming monoclinic crystals.

Quick facts Names, Identifiers ...
Terbium(III) sulfate
Names
Other names
  • Diterbium trisulphate
  • Terbium trisulfate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.815 Edit this at Wikidata
EC Number
  • anhydrous: 237-213-5
  • octahydrate: 634-368-4
  • anhydrous: InChI=1S/3H2O4S.2Tb/c3*1-5(2,3)4;;/h3*(H2,1,2,3,4);;/q;;;2*+3/p-6
    Key: UFPWIQQSPQSOKM-UHFFFAOYSA-H
  • octahydrate: InChI=1S/3H2O4S.8H2O.2Tb/c3*1-5(2,3)4;;;;;;;;;;/h3*(H2,1,2,3,4);8*1H2;;/q;;;;;;;;;;;2*+3/p-6
    Key: SRSFZSUHOIHUFR-UHFFFAOYSA-H
  • anhydrous: [O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[Tb+3].[Tb+3]
  • octahydrate: O.O.O.O.O.O.O.O.[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[Tb+3].[Tb+3]
Properties[1]
Tb2(SO4)3
Molar mass 606.02 g·mol−1
Appearance colorless solid
soluble
Structure[2]
monoclinic (octahydrate)
C2/c (No. 15)
a = 13.493 Å, b = 6.714 Å, c = 18.231 Å
α = 90°, β = 102.16°, γ = 90°
1614.5 Å3
4 units per cell
Hazards
GHS labelling:[3]
GHS07: Exclamation mark
Warning
H315, H319, H335
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).
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Properties

Green fluorescence of terbium sulfate under ultraviolet light

The octahydrate is isostructural with the octahydrates of praseodymium sulfate and dysprosium sulfate.[2]

It exhibits many forms of luminescence including triboluminescence,[4] chemiluminescence (such as during the thermal degradation of sodium persulfate in the presence of terbium sulfate),[5] and sonoluminescence (as a suspension in benzene, toluene, or p-xylene).[6]

Preparation

The octahydrate can be prepared by treating terbium(III,IV) oxide with sulfuric acid.[2] The anhydrous form is obtained by heating to 360 °C.[1]

Reactions

Terbium oxysulfide (Tb2O2S) is obtained by heating the hydrate under a reductive CO atmosphere at 1,033 K (760 °C; 1,400 °F).[7] If an air atmosphere is used instead, a terbium oxysulfate (Tb2O2SO4) forms at 1,323 K (1,050 °C; 1,922 °F).

Related compounds

Double sulfates such as sodium terbium sulfate are formed in the separation of lanthanides by fractional precipitation, a historically employed method.[8]

A hydrogensulfate sulfate (Tb(HSO4)(SO4)) has been characterized. It is prepared by solvothermal synthesis, crystallizes in the P21 space group, and exhibits second-harmonic generation.[9]

Several terbium sulfate-based solid state materials have been characterized by single-crystal X-ray diffraction. For example, inorganic frameworks such as the 1D (H3O)2(C2H8N)[Tb(SO4)3] and 3D (C2H8N)9[Tb5(SO4)12]·2H2O.[10] Such compounds are of research interest due to their photoluminescent properties.

References

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