| Names | |
|---|---|
| Other names Technetium(III) chloride | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
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| Properties | |
| Cl3Tc | |
| Molar mass | 204 g·mol−1 |
| Appearance | black solid |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Technetium trichloride is an inorganic compound oftechnetium andchlorine with the formula TcCl3.
Twopolymorphs of technetium trichloride are known. The α-polymorph is prepared as a black solid from ditechnetium(III) tetraacetate dichloride andhydrogen chloride at 300 °C. It has abioctahedral structure, consisting of triangular Tc3Cl9 units withC3v symmetry, with each Tc atom coordinated to two Tc neighbors and five chloride ligands (Tc-Tcbond length 2.44angstrom). The Tc-Tc distances are indicative of double bonded Tc atoms. Tc3Cl9 is isostructural to its rhenium homologue,trirhenium nonachloride.[1]
β-TcCl3 is obtained by the reaction between technetium metal and chlorine gas. Its structure consists of infinite layers of edge-sharing octahedra, similar toMoCl3 and ReCl3, with distances that also indicate metal-metal bonding. It is less stable than α-TcCl3 and slowly transforms into it.[1]