Ruthenium(III) iodide

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Ruthenium(III) iodide
Names
Other names
Ruthenium triiodide
Identifiers
3D model (
JSmol
)
ECHA InfoCard
 100.034.226 Edit this at Wikidata
  • InChI=1S/3HI.Ru/h3*1H;/q;;;+3/p-3
    Key: LJZVDOUZSMHXJH-UHFFFAOYSA-K
  • I[Ru](I)I
  • [I-].[I-].[I-].[Ru+3]
Properties
RuI3
Density 5.25 g cm−3
sparingly soluble[1]
Structure
hexagonal[1]
Thermochemistry
−247 J mol−1 K−1[1]
Std enthalpy of
formation
(ΔfH⦵298)
 −159 kJ mol−1[1]
Related compounds
Other anions
 Ruthenium(III) fluoride
Ruthenium(III) chloride
Ruthenium(III) bromide
Other cations
Osmium(III) iodide
Technetium(III) iodide
Rhodium(III) iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Ruthenium(III) iodide is a chemical compound containing ruthenium and iodine with the formula RuI3. It is a black solid.[2]

Preparation

Ruthenium(III) iodide can be prepared in several ways.[1][3]

The reaction of ruthenium tetroxide with aqueous hydroiodic acid:[4]

RuO4 + excess HI → RuI3

The thermal decomposition of pentaammineruthenium(III) iodide:[3]

Ru(NH3)5I3 → RuI3 + 5 NH3

The salt metathesis reaction of hydrated ruthenium(III) chloride with potassium iodide in aqueous solution:[1]

RuCl3·xH2O + 3 KI → RuI3 + 3 KCl + xH2O

Direct combination of the elements has been reported to succeed under some conditions (350 °C) but not others (500 °C and 20 atm):[1]

2 Ru + 3 I2 → 2 RuI3

Structure

Ruthenium(III) iodide adopts an extended structure with

octahedral coordination geometry at ruthenium.[4] There is some doubt about the characterisation of ruthenium(III) iodide and it may be an oxohalide or a hydroxyhalide.[1]

References

  1. ^
    ISBN 0-444-42375-3
    .
  2. ISBN 978-0-08-037941-8
    .
  3. ^
    ISBN 9780751404135
    .
  4. ^
    ISBN 978-0-13-175553-6
    .
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