Technetium(IV) chloride

Technetium(IV) chloride is the inorganic compound with the formula TcCl₄. It was discovered in 1957 as the first binary halide of technetium. It is the highest oxidation binary chloride of technetium that has been isolated as a solid. It is volatile at elevated temperatures and its volatility has been used for separating technetium from other metal chlorides.^[2] Colloidal solutions of technetium(IV) chloride are oxidized to form Tc(VII) ions when exposed to gamma rays.^[3]

Technetium(IV) chloride

Names
IUPAC name Technetium(IV) chloride
Other names Technetium tetrachloride, Technetium chloride
Identifiers
CAS Number	14215-13-5 Y
3D model (JSmol)	Interactive image
ChemSpider	73944719
PubChem CID	23047010
CompTox Dashboard (EPA)	DTXSID801045198
InChI InChI=1S/4ClH.Tc/h4*1H;/q;;;;+4/p-4 Key: DCEWLADEQKZQQZ-UHFFFAOYSA-J
SMILES [Cl-].[Cl-].[Cl-].[Cl-].[Tc+4]
Properties
Chemical formula	TcCl4
Molar mass	239.718 g/mol
Appearance	Red solid
Boiling point	300 °C (572 °F; 573 K)[1]
Structure
Crystal structure	Orthorhombic, oP40
Space group	Pbca, No. 61
Lattice constant	a = 0.603 nm, b = 1.165 nm, c = 1.406 nm α = 90°, β = 90°, γ = 90°
Related compounds
Other anions	Technetium(VI) fluoride
Other cations	Manganese(II) chloride Rhenium(V) chloride Ruthenium(III) chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Technetium tetrachloride can be synthesized from the reaction of Cl₂ with technetium metal at elevated temperatures between 300 and 500 °C:^[4]

Tc + 2 Cl₂ → TcCl₄

Technetium tetrachloride has also been prepared from the reaction of technetium(VII) oxide with carbon tetrachloride in a sealed vessel at elevated temperature:^[5]

Tc₂O₇ + 7 CCl₄ → 2 TcCl₄ + 7 COCl₂ + 3 Cl₂

At 450 °C under vacuum, TcCl₄ decomposes to TcCl₃ and TcCl₂.^[6]

As verified by X-ray crystallography, the compound is an inorganic polymer consisting of interconnected TcCl₆ octahedra.