13825-36-0

Basic information

• Product Name: thorium tetrahydroxide
• Synonyms: thorium tetrahydroxide;Tetrahydroxythorium(IV);Thorium(IV)tetrahydoxide;Einecs 237-522-5
• CAS NO: 13825-36-0
• Molecular Formula: H₄O₄Th
• Molecular Weight: 300.06746
• EINECS: 237-522-5
• Mol File: 13825-36-0.mol
• Article Data: 5

Chemical Properties

• Melting Point: decomposes [CRC10]
• Boiling Point: 100 °C at 760 mmHg
• Appearance: /
• Vapor Pressure: 24.5mmHg at 25°C
• CAS DataBase Reference: thorium tetrahydroxide(CAS DataBase Reference)
• NIST Chemistry Reference: thorium tetrahydroxide(13825-36-0)
• EPA Substance Registry System: thorium tetrahydroxide(13825-36-0)

Safety Data

• Hazardous Substances Data: 13825-36-0(Hazardous Substances Data)

Usage

Chemical Properties

prepared by addition of alkali to a solution of Th++++ salt, yielding a gelatinous precipitate which is subsequently dehydrated; absorbs CO2 to form ThOCO3 [KIR83]

InChI:InChI=1/4H2O.Th/h4*1H2;/p-4

Upstream product

• 1336-21-6 ammonium hydroxide 
• 1310-73-2 sodium hydroxide 
• 916329-38-9 hydrogen azide 
• 16065-92-2 thorium(IV) ion 
• 7732-18-5 water 

Downstream Products

• 13709-59-6 thorium tetrafluoride 

Relevant articles and documents

Comparisons of plutonium, thorium, and cerium tellurite sulfates

The hydrothermal reaction of PuCl3 or CeCl3 with TeO2 in the presence of sulfuric acid under the comparable conditions results in the crystallization of Pu(TeO3)(SO4) or Ce2(Te2O5)(SO4)2, respectively. Pu(TeO3)(SO4) and its isotypic compound Th(TeO3)(SO4) are characterized by a neutral layer structure with no interlamellar charge-balancing ions. However, Ce 2(Te2O5)(SO4)2 possesses a completely different dense three-dimensional framework. Bond valence calculation and UV-vis-NIR spectra indicate that the Ce compound is trivalent whereas the Pu and Th compounds are tetravalent leading to the formation of significantly different compounds. Pu(TeO3)(SO4), Th(TeO3)(SO4), and Ce2(Te2O 5)(SO4)2 represent the first plutonium/thorium/cerium tellurite sulfate compounds. Our study strongly suggests that the chemistries of Pu and Ce are not the same, and this is another example of the failure of Ce as a surrogate.

Structures of dimeric hydrolysis products of thorium

Three unique thorium dimeric compounds have been crystallized from either direct hydrolysis of Th4+(aq)/HCl or titration of Th(OH) 4(am) with Th(NO3)4(aq) and their structures determined using single-crystal X-ray diffraction. The compound [Th 2(μ2-OH)2(NO3)6(H 2O)6]H2O (1) is identical to that identified previously by Johansson. Two additional unreported compounds have been identified, [Th2(μ2-OH)2(NO 3)4(H2O)8](NO3) 2 (2) and [Th2(μ2-OH)2Cl 2(H2O)12]Cl4· 2H2O (3). 1 crystallizes in the monoclinic space group P21/c, with a = 6.792(2) A, b = 11.710(4) A, c = 13.778(5) A, and β = 102.714(5)° and 2 crystallizes in the monoclinic space group P2 1/n, with a = 6.926(5) A, b = 7.207(1), A, c = 21.502(1) A, and β = 96.380(1)°. The chloride-containing dimer, 3, crystallizes in triclinic P1, with a = 8.080(2) A, b = 8.880(2) A, c = 9.013(2) A, α = 97.41(3)°, β = 91.00(3), and γ = 116.54(3)°. We also present high-energy X-ray scattering data demonstrating the presence of the hydroxo-bridged moiety in solution and discuss our findings in the context of known solid-state structures. The three structures demonstrate 11-, 10-, and 9-coordinate thorium, respectively, and coupled with the scattering experiments provide additional structural and chemical insight into tetravalent actinide hydrolysis.