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

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]
−159 kJ mol−1[1]
Related compounds
Other anions
Ruthenium(III) fluoride
Ruthenium(III) chloride
Ruthenium(III) bromide
Other cations
Iron(III) iodide
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).

Preparation

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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

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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

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  1. ^ a b c d e f g h Seddon, Elaine A.; Seddon, Kenneth R. (1984). The Chemistry of Ruthenium. Elsevier. p. 161. ISBN 0-444-42375-3.
  2. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 1083. ISBN 978-0-08-037941-8.
  3. ^ a b Cotton, Simon A. (1997). Chemistry of Precious Metals. Springer Netherlands. p. 3. ISBN 9780751404135.
  4. ^ a b Housecroft, C. E.; Sharpe, A. G. (2008). Inorganic Chemistry (3rd ed.). Prentice Hall. p. 779. ISBN 978-0-13-175553-6.