 | |
| Names | |
|---|---|
| IUPAC name Scandium triiodide | |
| Other names Scandium(III) iodide Scandium(3+) triiodide Triiodoscandium | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.034.956 |
| EC Number |
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| UNII | |
| |
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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 | |
Otheranions | Scandium fluoride Scandium chloride Scandium bromide |
Othercations | Yttrium(III) iodide Lutetium(III) iodide |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Scandium triiodide, also known as scandium iodide, is aninorganic compound with the formula ScI3 and is classified as a lanthanideiodide. This salt 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 initiatephotopolymerizations.[2]
Scandium triiodide adopts a structure similar to that ofiron 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]
The purest scandium triiodide is obtained through direct reaction of the elements:[1]
Alternatively, but less effectively, one can produce anhydrous scandium triiodide by dehydrating ScI3(H2O)6.
