Indium(III) hydroxide

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Indium(III) hydroxide
Names
IUPAC name
Indium(III) hydroxide
Other names
Indium hydroxide, indium trihydroxide
Identifiers
3D model (
JSmol
)
ECHA InfoCard
 100.039.937 Edit this at Wikidata
EC Number
  • 243-947-7
UNII
  • InChI=1S/In.3H2O/h;3*1H2/q+3;;;/p-3
    Key: IGUXCTSQIGAGSV-UHFFFAOYSA-K
  • [OH-].[OH-].[OH-].[In+3]
Properties
In(OH)3
Molar mass 165.8404 g/mol
Appearance White solid
Density 4.38 g/cm3
Melting point 150 °C (302 °F; 423 K) (decomposes)
insoluble
1.725
Structure
cubic
Im3
octahedral
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 0: Will not burn. E.g. waterInstability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazards (white): no code
2
0
1
Related compounds
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Indium(III) hydroxide is the chemical compound with the formula In(OH)3. Its prime use is as a precursor to indium(III) oxide, In2O3.[1] It is sometimes found as the rare mineral dzhalindite.

Structure

Indium(III) hydroxide has a cubic structure, space group Im3, a distorted ReO3 structure.[2][3]

Preparation and reactions

Neutralizing a solution containing an In3+ salt such as

zincblende ore by Reich and Richter, the discoverers of indium.[6]

Indium(III) hydroxide is

amphoteric, like gallium(III) hydroxide (Ga(OH)3) and aluminium hydroxide (Al(OH)3), but is much less acidic than gallium hydroxide (Ga(OH)3),[5] having a lower solubility in alkaline solutions than in acid solutions.[7] It is for all intents and purposes a basic hydroxide.[8]

Dissolving indium(III) hydroxide in strong alkali gives solutions that probably contain either four coordinate [In(OH)4]− or [In(OH)4(H2O)]−.[8]

Reaction with acetic acid or carboxylic acids is likely to give the basic acetate or carboxylate salt, e.g. (CH3COO)2In(OH).[7]

At 10 MPa pressure and 250-400 °C, indium(III) hydroxide converts to indium oxide hydroxide (InO(OH)), which has a distorted rutile structure.[5]

Rapid decompression of samples of indium(III) hydroxide compressed at 34 GPa causes decomposition, yielding some indium metal.[9]

Laser ablation of indium(III) hydroxide gives indium(I) hydroxide (InOH), a bent molecule with an In-O-H angle of around 132° and an In-O bond length of 201.7 pm.[10]

References

  1. ISBN 978-0-470-68191-6
    .
  2. doi:10.3891/acta.chem.scand.21-1046
    .
  3. ISBN 0-19-855370-6
    .
  4. ^
    S2CID 195329927
    .
  5. ^
    ISBN 0123526515
    .
  6. ISBN 9788187224037
    .
  7. ^
    ISBN 978-0195393354
    .
  8. ^
    ISBN 0-7514-0103-X
    .
  9. PMID 20731389
    .
  10. ISSN 0022-2852
    .
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