7803-68-1Relevant articles and documents
A crystalline, large-pore, microporous semiconductor
Shulman, Alexander,Palmqvist, Anders E. C.
, p. 718 - 722 (2007)
Tubes, dumbbells, and pyramids: A crystalline, large-pore, microporous semiconductor, |Rb18| [Sb36O54][(SbTe 3)2(Te2)6] (Rb-CTH-1), which consists of an 18-ring {Sb18O27} tubular unit surrounded by an intricate, ordered arrangement of trigonal-pyramidal {SbTe 3}3- ions and Te22- dumbbells and lined with Rb+ ions, has been prepared (see picture; turquoise R). This semiconductor has a band gap of approximately 850 meV. (Figure Presented).
Incorporation of Sulfate or Selenate Groups into Oxotellurates(IV): III. Compounds with Magnesium or Zinc
Weil, Matthias,Shirkhanlou, Mahdi
, p. 749 - 756 (2017/07/07)
The mixed oxochalcogenate compounds Mg2(SO4)(TeO3)(H2O), Mg3(SO4)(TeO3)(OH)2(H2O)2, Zn2(SeO4)(TeO3), and Zn4(SO4)(TeO3)3 were obtained under hydrothermal conditions (210 °C, autogenous pressure). Structure analyses using single-crystal X-ray data revealed tellurium in all four compounds to be present in oxidation state +IV, whereas sulfur or selenium atoms exhibit an oxidation state of +VI. In the crystal structures of the two magnesium compounds, [MgO5(H2O)] octahedra [Mg2(SO4)(TeO3)(H2O) structure, isotypic with the Co and Mn analogues] or [MgO4(OH)2] and [MgO4(OH)2(H2O)2] octahedra [Mg3(SO4)(TeO3)(OH)2(H2O)2structure, novel structure type] as well as trigonal-pyramidal TeO32– anions make up metal oxotellurate sheets, which are bridged by SO42– anions. The polar crystal structure of Zn2(SeO4)(TeO3) is isotypic with Zn2(MoO4)(TeO3) and consists of [ZnO4] tetrahedra, [ZnO6] octahedra, SeO42– and TeO32– anions as principal building units that are connected into a framework structure. Such a structural arrangement, with basically the same coordination polyhedra as in Zn2(SeO4)(TeO3) but with SO42– instead of SeO42– anions, is also found in the tellurium-rich compound Zn4(SO4)(TeO3)3 that crystallizes in a novel structure type.
Oxidation of tellurium(IV) by tetrabutylammonium tribromide
Kalantre,Gokavi
, p. 2048 - 2050 (2007/10/03)
The reaction between tetrabutylammonium tribromide and tellurium(IV) has been studied in 50% (v/v) acetic acid under second order conditions. The overall order of reaction is found to be two, unity each in both the reactants. The reaction involves a direct two-electron transfer step since the test for the formation of free radicals due to single electron step was negative. The reaction is retarded by hydrogen ions due to protonation prior equilibria of the reductant, tellurium(IV). The active species of the reactants is found to be tribromide ion of the oxidant and HTeO3- of the reductant. Considerable decrease in the entropy of activation of the reaction indicates formation of an ordered transition state between the two reactants analogous to that in alcohol oxidation by tetrabutylammonium tribromide ion.
Synthesis, structure and thermal stability of tellurium oxides and oxide sulfate formed from reactions in refluxing sulfuric acidf
Ahmed, Mohammad A. K.,Fjellvag, Helmer,Kjekshus, Arne
, p. 4542 - 4549 (2007/10/03)
Reactions between Te, TeO2, TeCl4, TeO3 or H6TeO6 and 30-95 vt% H2SO4 were studied at temperatures up to the boiling point of the acid. Depending on the tellurium-containing reactant, H2SO4 concentrat
125Te and 19F NMR spectroscopic study of the hydrolysis of pentafluorotellurium chloride: evidence for trans- and cis-HOTeF4Cl and cis,mer-(HO)2TeF3Cl
Lawlor, Lawrence J.,Martin, Alban,Murchie, Michael P.,Passmore, Jack,Sanders, Jeremy C. P.
, p. 1501 - 1505 (2007/10/02)
The hydrolysis of TeF5Cl has been followed by (125)Te and (19)F NMR spectroscopy.The spectra show that the known series (HO)nTeF(6-n) (n=2-6) are present.In addition the spectra are consistent with the presence of the previously unreported series (HO)nTeF(5-n)Cl (n=1-3) as well as unidentified fluorotellurium(IV) species.Evidence is presented for the new species trans- ans cis-HOTeF4Cl and cis,mer-(HO)2TeF3Cl.The course of the hydrolysis of TeF5Cl is compared with that of SF5Cl. Key words: trans-tetrafluorotellurium hydroxychloride, cis-tetrafluorotellurium hydroxychloride, cis,mer-tetrafluorotellurium dihydroxychloride, pentafluorotellurium chloride, hydrolysis.
