Promethium(III) iodide
| Promethium(III) iodide | |
|---|---|
| Other names | Promethium triiodide |
| Identifiers | |
| Standard InChI | InChI=1S/3BrH.Pm/h3*1H;/q;;;+3/p-3 |
| Standard InChIKey | GWRKFHUNEGTAQB-UHFFFAOYSA-K |
| CAS number | [] |
| Properties[1][2] | |
| Chemical formula | PmI3 |
| Molar mass | 527.63 g mol−1 [note 1] |
| Appearance | red solid |
| Density | 5.95 g cm−3 |
| Melting point |
695 °C |
| Structure[1][2] | |
| Crystal structure | Plutonium tribromide |
| Lattice constant | a = 424(1) pm, b = 1393(7) pm, c = 996(2) pm |
| Coordination geometry | bicapped trigonal prismatic (Pm3+) |
| Structure[1][2] | |
| Crystal structure | Bismuth triiodide |
| Lattice constant | a = 765(3) pm, c = 2110(10) pm |
| Coordination geometry | octahedral (Pm3+) |
| Related compounds | |
| Other anions | Promethium(III) fluoride Promethium(III) chloride Promethium(III) bromide |
| Other cations | Praseodymium(III) iodide Neodymium(III) iodide Samarium(III) iodide Europium(III) iodide |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Promethium(III) iodide, PmI3, is the only known iodide of promethium. It is prepared (on a 100-µg scale) by reacting gaseous hydrogen iodide with promethium(III) oxide at 400 °C.[1] At ambient temperature, it has the plutonium tribromide structure with eight-coordinate promethium, isostructural with NdI3: a high-temperature modification has the bismuth triiodide structure with six-coordinate promethium, isostructural with SmI3.[1][2]
Notes and references
Notes
- ↑ The molar mass is based on promethium-147 (t½ = 2.6234(2) a; Ar = 146.915 1385(26)),[3] the most commonly encountered isotope of promethium.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Cotton, Simon Lanthanide and Actinide Chemistry, 2nd ed.; Wiley: New York, 2006; pp 115–17. ISBN 0470010061.
- ↑ 2.0 2.1 2.2 2.3 Wilmarth, W. R.; Haire, R. G.; Young, J. P.; Ramey, D. W.; Peterson, J. R. Absorption spectrophotometric and X-ray diffraction studies of the trihalides of promethium in the solid state. J. Less Common Met. 1988, 141 (2), 275–84. DOI: 10.1016/0022-5088(88)90413-4.
- ↑ Audi, G.; Bersillon, O.; Blachot, J.; Wapstra, A. H. The NUBASE evaluation of nuclear and decay properties. Nucl. Phys. A 2003, 729, 3–128. doi:10.1016/j.nuclphysa.2003.11.001, <http://amdc.in2p3.fr/nubase/Nubase2003.pdf>.
Further reading
- Wilmarth, W. R.; Begun, G. M.; Haire, R. G.; Peterson, J. R. Raman spectra of Pm2O3, PmF3, PmCl3, PmBr3 and PmI3. J. Raman Spectrosc. 1988, 19 (4), 271–75. DOI: 10.1002/jrs.1250190410.
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