Tellurium Perchlorate

Tellurium perchlorate, iodate, and methylthiosulfate, as weU as Te(IV) salts of aUphatic and aromatic acids, have been prepared. 

Tellurium Perchlorate.—By dissolving tellurium dioxide in warm concentrated perchloric acid, a clear solution is obtained which on cooling deposits glistening hexagonal crystals having the composition 2Te02.HC104.7... 

Tellurium and Ohloiunb -Tellurium Oiehloride, Tellurium Tetrachloride -Tellurium Perchlorate. 

R—Te—O —C103 aryl tellurium perchlorate tellurenyl perchlorate... 

The diaryl tellurium perchlorates were isolated as complexes with N- or O-donor ligands2. 

Z 1 Niobium 1 Nitrate 1 Osmium 73 a. I Perchlorate Phenols u a o Platinum o 0. 1 5 u 1 Rhodium 1 Rubidium Ruthenium Scandium 1 Selenium Silver I Sodium 1 Strontium 1 Sulphate Sulphides, organic Sulphur dioxide 1 Tantalum 1 Tellurium 1 Thallium Thorium e H 1 Titanium a u ab a 1- I Uranium 1 Vanadium 1 Yttrium 1 Zinc Zirconium... 

Vittori O (1980) Polarographie study of adsorbed tellurium at the hanging and dropping mercury electrodes in 1 M hydrochloric or perchloric acid solutions. Anal Chim Acta 121 315-319... 

Feliu JM, G6mez R, Llorca MJ, Aldaz A. 1993b. Electrochemical behavior of irreversible adsorbed tellurium dosed from solution on Pt(M/) single crystal electrodes in sulphuric and perchloric acid media. Surf Sci 297 209-222. 

Tellurium. The NIOSH Method S-204 for analysis of in air was originally developed using Te(0H)2 (8). RTI applied this procedure to the analysis of the pure metal. The procedure involves the use of both nitric and perchloric acids during the digestion. Recoveries were excellent, 97 percent. An additional set of samples were subjected to a digestion involving no perchloric acid,... 

Tellurium metal was found to be recovered adequately not only with the NIOSH procedure using nitric acid/perchloric acid but also with a simple nitric acid procedure. 

Although tellurium tetrachloride has been reported55 to form a 1 2 complex with acetamide, there appears to be little other information available on the complex. Similarly, the reported tributyl phosphate complex of polonium tetrachloride56 has received little attention. The formation of a polonium(IV) perchlorate complex with tributyl phosphate has been suggested57 in the solvent extraction of polonium from perchloric acid. 

This compound, the perchloric acid adduct of the selenoxide, exploded at 139°C during melting point determination. The tellurium analogue was similar. 

The Oxy-Acids of the Halogens Perchlorates and Periodates Chlorates, Bromates, and lodates Chlorites Hypochlorites, Hypobromltes, and Hypolodites—Acids and Salts of Sulphur, Selenium, and Tellurium of Molybdenlum, Tungsten, and Uranium—Perchromates, Persulpbates, Perborates, and Percarbonates. 

Elemental tellurium and bis[dimethylaminothiocarbonyl] disulfide were electrolyzed (50 V) in acetone/tetraethylammonium perchlorate for 109 minutes at an initial current of 24 mA. Thirty milligrams of tellurium dissolved and produced tellurium tetrakis[dimethyldithio-carbamate] in 86% yield7. 

Tellurium was dissolved in aqueous sodium hydroxide. The solution was acidified with perchloric acid and an excess of sodium dialkyldithiocarbamate was added. Tris[dialkyl-dithiocarbamate] perchlorates of tellurium percipitated4. The X-ray structure analysis investigation of tellurium tris[dimethyldithiocarbamate] perchlorate revealed that all three dithiocarbamate groups and the perchlorate ion are bidentate4. 

Only a few examples of this class of compounds containing divalent tellurium are known. The aryl tellurium nitrates and perchlorates have been isolated only in the form of their adducts with thiourea, triphenylarsine oxide, or as hetaryl A -oxidcs. 

Phenyl thiourea tellurium nitrate and perchlorate were isolated when nitric or perchloric acid were added to aqeuous solutions containing phenyl tellurium chloride and thiourea. 

Tetralelluride anions were generated by cathodic reduction of tellurium at — 1.4 V in a cell consisting of a tellurium cathode and a platinum-net anode. AIM solution of dry sodium perchlorate in dimethylformamide served as the catholy te. The tetratelluride ions were then reacted with alkyl halides to yield the corresponding dialkyl ditellurium5. 

Bis[dimethylpropylsilylmethyl] Ditellurium5 An H-shapcd electrolytic cell with a ealholyte volume of 100 ml is fitted with a tellurium cathode (99.99% purity, 15-20 cm2 surface area) and a platinum-net anode. To the cathode compartment, separated from the anode by a ceramic diaphragm of 1.6 gm pore size, are added 100 ml of a 1 molar solution of dry sodium perchlorate in dimethylformamide and the catholyte is deaerated with argon. At a cathode potential of 1.4 V with respect to an aqueous saturated calomel electrode, 2500... 

A mixture of aryl ethoxycarbonylmethyl tellurium and 3,6-bis[dimethylimino]-l,2,4,5-tetrathiane diperchlorate (caution this compound explodes when heated or an impact ) suspended in 40 ml acetonitrile was cautiously heated on a water bath at 60° or kept at 20° overnight. Aryl tellurium bis[dimethyldithiocarbamate] perchlorates were isolated in 70 to 90% yield2. 

The sodium borohydride method appears to be the most convenient and most widely applicable route to dialkyl telluriums. Sodium dithionite was also used to prepare disodium telluride11, which subsequently was reacted with methyl, ethyl, propyl, and pentyl halides. Tellurium was also electrochemically reduced to the telluride anion in an ultrasonically aided reaction15 using tellurium powder in acetonitrile, and to the tetratelluride dianion with a tellurium rod as cathode and sodium perchlorate in dimethylformamide as electrolyte16. 

Diphenyl tellurium dichloride and silver perchlorate in dichloromethane were stirred for one hour. The precipitated silver chloride was removed by filtration to give a solution of diphenyl tellurium diperchlorate. This compound was not isolated but treated with O- or N-donors such as pyridine and pyridine N-oxides. The 1 1 adducts were obtained as colorless, crystalline substances in almost quantitative yields. Bis[4-methoxyphenyl] tellurium dichloride and telluracyclopentane 7e-diiodide were similarly converted to the perchlorates2. 

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