Chemistry:Scandium triiodide
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| Names | |
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| IUPAC name
Scandium triiodide
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| Other names
Scandium(III) iodide
Scandium(3+) triiodide Triiodoscandium | |
| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
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PubChem CID
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| Properties | |
| ScI3 | |
| Molar mass | 425.66 |
| Appearance | Yellowish solid |
| Melting point | 920 °C (1,690 °F; 1,190 K) |
| Related compounds | |
Other anions
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Scandium fluoride Scandium chloride Scandium bromide |
Other cations
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Yttrium(III) iodide Lutetium(III) iodide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Scandium triiodide, also known as scandium iodide, is an inorganic compound with the formula ScI3 Sometimes classified as a rare earth iodide, this compound is a yellowish powder.[1] It is used in metal halide lamps together with similar compounds, such as caesium iodide, because of their ability to maximize emission of UV and to prolong bulb life. The maximized UV emission can be tuned to a range that can initiate photopolymerizations.[2]
Scandium triiodide adopts a structure similar to that of iron trichloride (FeCl3), crystallizing into a rhombohedral lattice. Scandium has a coordination number of 6, while iodine has a coordination number of 3 and is trigonal pyramidal.[3]
High purity scandium triiodide is obtained through direct reaction of the elements:[1]
- 2 Sc + 3 I2 → 2 ScI3
Alternatively, but less effectively, one can produce anhydrous scandium triiodide by dehydrating ScI3(H2O)6.
The octahydrate is also known: formula ScI3(H2O)8.[4][4]
Further information
- Tomasz Mioduski, Cezary Gumiski, and Dewen Zeng "Rare Earth Metal Iodides and Bromides in Water and Aqueous Systems. Part 1. Iodides" Journal of Physical and Chemical Reference Data 2012, vol. 41, 013104-1 to 013104-63. doi:10.1063/1.3682093
References
- ↑ 1.0 1.1 Haeberle, N., 1973, Preparation of highly pure lanthanide iodides, Technisch-Wissenschaftliche Abhandlungen der Osram-Gesellschaft, v. 11, p. 285
- ↑ Brabham, D.E., Metal halide lamp for curing adhesives. U.S. Patent 6,888,312, March 1, 2011
- ↑ Men'kov, A. A., Komissarova, L. N., 1964, X-ray study of scandium iodide, Zhurnal Neorganicheskoi Khimii, v. 9, p. 766
- ↑ 4.0 4.1 Lim, Kevin C.; Skelton, Brian W.; White, Allan H. (2001). "Crystal Structures of the ('Maximally') Hydrated Scandium Halides, ScX3.nH2O (X = Cl, Br, I)". Australian Journal of Chemistry 53 (10): 875–878. doi:10.1071/CH00120.
| HI | He | ||||||||||||||||
| LiI | BeI2 | BI3 | CI4 | NI3 | I2O4, I2O5, I4O9 |
IF, IF3, IF5, IF7 |
Ne | ||||||||||
| NaI | MgI2 | AlI3 | SiI4 | PI3, P2I4 |
S | ICl, ICl3 |
Ar | ||||||||||
| KI | CaI2 | Sc | TiI4 | VI3 | CrI3 | MnI2 | FeI2 | CoI2 | NiI2 | CuI | ZnI2 | Ga2I6 | GeI2, GeI4 |
AsI3 | Se | IBr | Kr |
| RbI | SrI2 | YI3 | ZrI4 | NbI5 | Mo | Tc | Ru | Rh | Pd | AgI | CdI2 | InI3 | SnI4, SnI2 |
SbI3 | TeI4 | I | Xe |
| CsI | BaI2 | HfI4 | TaI5 | W | Re | Os | Ir | Pt | AuI | Hg2I2, HgI2 |
TlI | PbI2 | BiI3 | Po | AtI | Rn | |
| Fr | RaI2 | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og | |
| ↓ | |||||||||||||||||
| La | Ce | Pr | Nd | Pm | SmI2 | Eu | Gd | TbI3 | Dy | Ho | Er | Tm | Yb | Lu | |||
| Ac | ThI4 | Pa | UI3, UI4 |
Np | Pu | Am | Cm | Bk | Cf | EsI3 | Fm | Md | No | Lr | |||
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