Tellurium with

Pentafluorophenylditelluridc yields 79-80% pentafluorophenyltellunum tri fluoride on treatment with fluorine or xenon difluoride [105] The fluonnated tetravalent tellurium can be further oxidized to hexavalent tellurium with either xenon difluoride [/22] or fluorine [123]... 

Selenophene and tellurophene were obtained in 15-20% yield by the reaction of selenium and tellurium with diacetylene in the KOH/DMSO/N2H4-H2O/H2O system at 0-20°C (90MI1). 

The C-Se and C-Te bonds are formed by an internal homolytic substitution of vinyl or aryl radicals at selenium or tellurium with the preparation of selenophenes and tellurophenes, respectively. An example is shown below, where (TMSIsSiH was used in the cyclization of vinyl iodide 65 that affords... 

C22-0011. Identify the nuclides that decay in the following manner (a) A nuclide undergoes 3 and y decay to give Z = 58 and A = 140 (b) A nuclide undergoes a decay to give polonium-218 and (c) A nuclide captures an orbital electron to give tellurium with 73 neutrons. 

C22-0046. Identify the product of each of the following decay processes (a) tellurium with 73 neutrons emits a y ray (b) tellurium with 71 neutrons captures an electron and (c) tellurium with 75 neutrons... 

As a matter of fact, this book is concerned with sulfur, selenium, and tellurium as components of compound or solid solution systems in which metallic or semimetal-lic elements, whatsoever, participate as well. In particular, it is focused on the electrochemistry of the inorganic compounds of sulfur, selenium, and tellurium with metals and semimetals, which collectively may be termed as metal chalcogenide (MCh) systems. 

With metalloids, the reactions are dangerous too. There are cases of accidents during which violent combustions or detonations occur with carbon, phosphorus, arsenic, sulphur and tellurium (with silver iodate, in this last case). Friction is one of the main factors. 

Numerous Zind anions are formed by selenium and tellurium, with some of the more prominent species being Se 2 (where n 2, 4, 5, 6, 7, 9, or 11). The species with n = 11 contains two rings that have five and six members that are joined by a selenium atom. Those with smaller numbers of selenium atoms generally consist of zigzag chains. Tellurium forms an extensive series of polyanions that are present in such species as NaTe (n = 1 to 4). One tellurium anion contains the Hg4Te124 ion, but other species such as [( lg2Tes) 2 are also known, such as the Te122 anion that is present in some cases where the cation is a +1 metal. 

This review is conceived as a progress report. It includes only compounds of selenium and tellurium with the element directly bonded to fluorine. The chemical literature of the last 10 years, including 1979, has been searched thoroughly, and emphasis has been placed on facts rather than on interpretation. There are some earlier reviews covering the same area "Fluorine Compounds of Selenium and Tellurium 1970 (40), "Inorganic Selenium Chemistry 1975 (48), and "Inorganic Chemistry of Tellurium 1975 (53). 

Tellurium dioxide is prepared by oxidation of elemental tellurium with concentrated nitric... 

Sodium hydrogen telluride is prepared by reduction of tellurium with NaBH4 under several conditions. The original procedure uses ethanol as the solvent, adding, after complete reduction of the tellurium, an appropriate amount of acetic acid (see Section 4.1.2, ref. 10 Section 4.1.7, ref. 29). 

Sodinm tellnride can be prepared under mild conditions from the elements in the presence of catalytic amonnts of naphthalene or by treating tellurium with sodium naphthaUde. ... 

Sodium telluride and sodinm 0,0-diethyl phosphorotellurolate, prepared respectively by the Te/NaBH4DMF method and by the reaction of elemental tellurium with NaH and 0,0-diethyl phosphate in ethanol, react with arenediazonium fluoroborates, giving good yields of diaryl tellurides. ... 

Reaction of elemental tellurium with arenediazonium salts ... 

Sodium telluride, obtained by heating elemental tellurium with sodium hydride in DMF, reacts similarly, leading to symmetrical divinylic tellurides (compare the similar reaction with aryl iodides, see Section 3.1.2.1). 

The reaction of dibutyldidecyl tellurium with phenylacetylenes yields nearly statistical ratios of products. 

Refined tellurium contains traces of lead, copper, iron, selenium, and other impurities. Highly pure tellurium can be obtained either by distilling refined tellurium in vacuum or by the zone melting process. The last traces of selenium can be removed as hydride by treating molten tellurium with hydrogen. 

The higher sulfides of tellurium such as TeS2 and TeSs, are obtained from tellurite solutions by precipitation with hydrogen sulfide or sodium sulfide. Tellurium reacts with concentrated sulfuric acid to form red oxysulfide of the composition, TeSOs. With nitric acid, the metal is oxidized to dioxide, Te02. Oxidation of tellurium with chromic acid or potassium permanganate in nitric acid yields orthotelluric acid (HeTeOe). 

Tellurium forms binary teUurides with several metals. The reaction is carried out by heating tellurium with a metal in stoichiometric amounts in the absence of air in an evacuated ampoule. Tellurium reacts with halides of several metals, when heated in a stream of hydrogen, to produce metal tel-lurides. 

After commenting on the discovery of gallium, scandium, and germanium (eka-aluminum, eka-boron, and eka-silicon), D. I. Mendeleev had written in 1891, I foresee some more new elements, but not with the same certitude as before. I shall give one example, and yet I do not see it quite distinctly (7). He had then proceeded to describe an undiscovered dvi tellurium with an atomic weight of about 212. Since polonium resembles tellurium and has an estimated atomic weight of about 210, it is probably the realization of Mendeleev s dvi tellurium. ... 

The eight-atom systems provide a compelling illustration of the structural diversity of tellurium polycations. There are examples of (a) structural isomers of the monomeric dication Tcg, (b) a polymeric (Teg ) cation and (c) a tetracation Teg" . Unlike cyclo-Sg and -Seg , the Teg dication cannot be made by oxidising tellurium with MF5 (M = As or Sb) in liquid SO2. However, the reactions of (a) the tellurium subhalide Te3Cl2 with ReC at 200 °C and (b) tellurium with WCl6 at 180°C produce the salts Teg[MCl6] (w=l, M = Re ... 

Lead Alloys. A tellurium—lead alloy containing 0.02—0.1% tellurium, with or without antimony, was introduced in 1934 (81) as tellurium lead or Teledium. This alloy has higher recrystallization temperatures and corrosion resistance and takes a significandy longer time to soften at 25°C after cold work. 

Put 3-5 g of powdered tellurium into a 0.5-litre beaker. Wet the tellurium with distilled water, pour 30-50 ml of concentrated hydrochloric acid into it, and add 10-30 ml of concentrated nitric acid in small portions. Heat the reaction mixture, covering the beaker with a watch glass. If the tellurium does not dissolve completely, dilute the reaction mixture up to one-third of its volume with water, and filter the solution through a fluted filter wetted with a 5% solution of hydrochloric acid. Add 100 ml of hot water (80 °C) to the filtrate while constantly stirring it. What is observed ... 

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