Thallium(III) hydroxide
Names
IUPAC name
Thallium(III) hydroxide[1]
Other names
Thallium trihydroxide[1]
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/3H2O.Tl/h3*1H2;/q;;;+3/p-3 checkY
    Key: GEPJDKDOADVEKE-UHFFFAOYSA-K checkY
  • O[Tl](O)O
Properties
Tl(OH)3
Molar mass 255.4053 g/mol
Appearance White solid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Thallium(III) hydroxide, Tl(OH)3, also known as thallic hydroxide, is a hydroxide of thallium. It is a white solid.

Thallium(III) hydroxide is a very weak base; it dissociates to give the thallium(III) ion, Tl3+, only in strongly acidic conditions.

Preparation

Thallium(III) hydroxide can be produced by the reaction of thallium(III) chloride with sodium hydroxide[2] or the electrochemical oxidation of Tl+ in alkaline conditions.[3]

References

  1. ^ a b https://pubchem.ncbi.nlm.nih.gov/compound/Thallium_III_-hydroxide
  2. ^ Glushkova, M. A. Reaction for the formation of the hydroxide of trivalent thallium. Zhurnal Neorganicheskoi Khimii, 1959. 4: 1657-1660. ISSN 0044-457X
  3. ^ Paul Delahay, G. L. Stiehl (April 1951). "The Anodic Oxidation of Thallous Ion on the Rotating Platinum Microelectrode". Journal of the American Chemical Society. 73 (4): 1755–1756. doi:10.1021/ja01148a093. ISSN 0002-7863. Retrieved 2020-06-01.

Synthesis Thallium(I) hydroxide is obtained from the decomposition of thallium(I) ethoxide in water.[3]

CH3CH2OTl + H2O → TlOH + CH3CH2OH This can also be done by direct reaction of thallium with ethanol and oxygen gas.

4 Tl + 2 CH3CH2OH + O2 → 2 CH3CH2OTl + 2 TlOH Another method is the reaction between thallium(I) sulfate and barium hydroxide.

Tl2SO4 + Ba(OH)2 → 2 TlOH + BaSO4 Properties Thallous hydroxide is a strong base; it dissociates to the thallous ion, Tl+, except in strongly basic conditions. Tl+ resembles an alkali metal ion, such as Li+ or K+.

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