Tellurium Chloride Fluoride

The reaction of bis[trifluoromethyl] tellurium with chlorine fluoride at — 78° with fluorotrichloromethane as solvent first produced his[trifluoromethyl] tellurium chloride fluoride. When the reaction mixture was concentrated, the l9F-NMR signal of the chloride fluoride disappeared and was replaced by signals for bis[trifluoromethyl] tellurium difluoride and bis[trifluoromethyl] tellurium dichloride2. The diorgano tellurium dihalides reported in the literature as mixed dihalides might be mixtures of symmetrical dihalides. All mixed halide species were identified by 125Te- and 19F-NMR spectroscopy in dimethylformamide solutions prepared from equimolar amounts of two different tellurium dihalides3. 

Bis pentafluoroethyl] tellurium difluoride (m.p. 57°) was obtained in quantitative yield from bis[pentafluoroethyl] tellurium and a mixture of xenon difluoride and sulfuryl chloride fluoride at — 45°4. 

Fig. 2. Comparison of the molecular structures of the tellurium(IV) fluoride, chloride, and iodide types in the solid state. The selenium(IV) chlorides and bromides as well as tellurium(IV) bromide and one of the five forms of tellurium(lV) iodide are isostructural to the cubane-like Te4Cli6 molecules (244).

Silver difluoride, 0014 Silver fluoride, 0013 Sodium chloride, 4036 Sodium iodide, 4623 Tantalum pentachloride, 4185 Tellurium tetrabromide, 0296 Thallium, 4922 Tin(II) chloride, 4116 Tin(IV) chloride, 4174 Tin(II) fluoride, 4331 Titanium(II) chloride, 4117 Titanium dibromide, 0284 Titanium diiodide, 4630 Titanium tetrachloride, 4176 Titanium tetraiodide, 4638 Titanium trichloride, 4158... 

Silicon dibromide sulfide, 0281 Silicon tetralluoride, 4352 Sulfinyl bromide, 0274 Sulfinyl chloride, 4096 Sulfinyl fluoride, 4318 Sulfonyl chloride, 4099 Sulfur dibromide, 0280 Sulfur dichloride, 4113 Sulfur hexafluoride, 4374 Sulfur tetralluoride, 4350 Tellurium tetrachloride, 4175... 

Silicon dibromide sulfide, 0280 Silicon tetrafluoride, 4346 Sulfinyl bromide, 0273 Sulfinyl chloride, 4090 Sulfinyl fluoride, 4312 Sulfonyl chloride, 4093 Sulfur dibromide, 0279 Sulfur dichloride, 4107 Sulfur hexafluoride, 4368 Sulfur tetrafluoride, 4344 Tellurium tetrachloride, 4169... 

TaF6 Tantalum(V) fluoride, 3 179 TeBr6K2 Potassium hexabromo-tellurate(IV), 2 189 TeCl4 Tellurium (IV) chloride, 3 140... 

The platinum metal chalcogenides in general are easier to prepare than the corresponding oxides. Whereas special conditions of temperature and pressure are required to prepare many of the oxides, the platinum metals react most readily with S, Se, and Te. A number of additional differences concerning the chemistry of the chalcogenides and the oxides are summarized as follows The metal—sulfur (selenium, tellurium) bond has considerably more covalent character than the metal-oxygen bond and, therefore, there are important differences in the structure types of the compounds formed. Whereas there may be considerable similarity between oxides and fluorides, the structural chemistry of the sulfides tends to be more closely related to that of the chlorides. The latter compounds... 

Methoxyphenyl Tellurium Trilluoride1 A 100 ml two-necked flask fitted with a magnetic stirrer and a reflux condenser is charged with 1.3 g (6 mmol) of silver fluoride and 30 ml of dry toluene. The stirred suspension is heated to reflux, 0.68 g (2 mmol) of 4-methoxyphenyl tellurium trichloride are added in small portions, and refluxing is continued for 3 h. The mixture is allowed to cool to 20°, silver chloride is filtered off, and fight petroleum is added to the filtrate. The precipitated product is collected and dried m.p. 176 178 . 4-Ethoxy phenyl tellurium trifluoride (m.p. 204°) was similarly prepared. 

Triphenyltrifluoro tellurium and excess phosphorus pentafluoride in dichloromethane form triphenyldifluorotellurium(VI) hexafluorophosphate, which, upon treatment with sodium fluoride, reverts to triphenyltrifluoro tellurium, and upon treatment with benzyltrimethylammonium chloride yields triphenylchlorodifluoro tellurium4> 5. 

Uranium can be analysed as the hexafluoride, but the procedure requires modification of the chromatographic apparatus, nickel coating of metallic parts and nickel filaments in the katharometer [606], Tin in zirconium—tin alloys can be analysed as the chloride, prepared by treatment with chlorine [607]. Selenium and tellurium are converted into fluorides by treatment of their oxides with xenon difluoride [608]. 

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