| Names | |
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| Other names Technetium(III) chloride | |
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| Properties | |
| Chemical formula | Cl3Tc |
| Molar mass | 204 g·mol |
| Appearance | black solid |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references | |
Technetium trichloride is an inorganic compound of technetium and chlorine with the formula TcCl3.
Preparation and properties
Two polymorphs of technetium trichloride are known. The α-polymorph is prepared as a black solid from ditechnetium(III) tetraacetate dichloride and hydrogen chloride at 300 °C. It has a bioctahedral structure, consisting of triangular Tc3Cl9 units with C3v symmetry, with each Tc atom coordinated to two Tc neighbors and five chloride ligands (Tc-Tc bond length 2.44 angstrom). The Tc-Tc distances are indicative of double bonded Tc atoms. Tc3Cl9 is isostructural to its rhenium homologue, trirhenium nonachloride.
β-TcCl3 is obtained by the reaction between technetium metal and chlorine gas. Its structure consists of infinite layers of edge-sharing octahedra, similar to MoCl3 and ReCl3, with distances that also indicate metal-metal bonding. It is less stable than α-TcCl3 and slowly transforms into it.
References
- ^ Poineau, Frederic; Johnstone, Erik V.; Weck, Philippe F.; Kim, Eunja; Forster, Paul M.; Scott, Brian L.; Sattelberger, Alfred P.; Czerwinski, Kenneth R. (2010). "Synthesis and Structure of Technetium Trichloride". Journal of the American Chemical Society. 132 (45): 15864–5. doi:10.1021/ar400225b. PMID 24393028.
| Technetium compounds | |
|---|---|
| Technetium(II) | |
| Technetium(III) | |
| Technetium(IV) | |
| Technetium(V) | |
| Technetium(VI) | |
| Technetium(VII) | |