Ruthenium(III) iodide
| Names | |
|---|---|
| Other names Ruthenium triiodide | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.034.226 |
| EC Number |
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PubChem CID | |
CompTox Dashboard (EPA) | |
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| Properties | |
| RuI3 | |
| Density | 5.25 g cm−3 |
| sparingly soluble[1] | |
| Structure | |
| hexagonal[1] | |
| Thermochemistry | |
Std molar entropy (S⦵298) | −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 | 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. doi:10.1016/C2009-0-30414-6. 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.