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Ruthenium(III) iodide
Names
	Other names Ruthenium triiodide
Identifiers
CAS Number	715652-38-3 ;
3D model (JSmol)	Interactive image; Interactive image;
ECHA InfoCard	100.034.226
CompTox Dashboard (EPA)	DTXSID90930261 ;
	InChI InChI=1S/3HI.Ru/h3*1H;/q;;;+3/p-3 Key: LJZVDOUZSMHXJH-UHFFFAOYSA-K;
	SMILES I[Ru](I)I; [I-].[I-].[I-].[Ru+3];
Properties
Chemical formula	RuI3
Density	5.25 g cm−3
Solubility in water	sparingly soluble
Structure
Crystal structure	hexagonal
Thermochemistry
Std molar; entropy (S⦵298)	−247 J mol−1 K−1
Std enthalpy of; formation (ΔfH⦵298)	−159 kJ mol−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). Infobox references

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

^ ^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.
^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 1083. ISBN 978-0-08-037941-8.
^ ^a ^b Cotton, Simon A. (1997). Chemistry of Precious Metals. Springer Netherlands. p. 3. ISBN 9780751404135.
^ ^a ^b Housecroft, C. E.; Sharpe, A. G. (2008). Inorganic Chemistry (3rd ed.). Prentice Hall. p. 779. ISBN 978-0-13-175553-6.

[Seddon-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.

[G&E-2] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 1083. ISBN 978-0-08-037941-8.

[Cotton-3] Cotton, Simon A. (1997). Chemistry of Precious Metals. Springer Netherlands. p. 3. ISBN 9780751404135.

[Housecroft-4] Housecroft, C. E.; Sharpe, A. G. (2008). Inorganic Chemistry (3rd ed.). Prentice Hall. p. 779. ISBN 978-0-13-175553-6.

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