Insertion Of Tellurium Research Articles

Elemental tellurium in organoelement synthesis of tellurium-containing organometallics and telluracycles

An overview presents the known methods of using elemental tellurium in the synthesis of various acyclic and cyclic, saturated and unsaturated compounds containing Te–E bonds (E = main group atom or transition metal atom). These methods include the insertion of tellurium into the C–E (E = halogen, Al, Ga, Sn, Zr) and P–E (E = Li, P, Si, Ge and Sn) and Sn–Sn single bonds and the addition to the E=E (E = Si, Ge and Sn) double bond, and PC triple bond, as well as the breakdown of the C=C double bond and the exchange of metal (Hg, Ag) and non-metal (B, I) for Te. Reactions with carbenes, their heavier (Si, Ge, Sn) analogs and free radicals are also discussed, as are the oxidation of organophosphorous (III) compounds, silanes and germanes with Te and the direct cyclisation of alkanes, arenes and heteroarenes containing two halogenomethyl fragments with elemental Te. Three-component heterocyclizations involving elemental tellurium and leading to telluracycles are also discussed. The reactions mentioned above are compared to those involving lighter chalcogens.

Electron Transport in Tellurium Nanowires

The temperature and magnetic field dependences of the voltage-current characteristics of tellurium nanowires manufactured via the insertion of tellurium into chrysotile asbestos pores from a melt have been measured. The measurements have been performed within a broad range of temperatures and magnetic fields. The results of such measurements are analyzed by means of their comparison with the predictions of theoretical models developed for the case of one-dimensional structures. The obtained dependences are concluded to most closely correspond to Luttinger liquid theory predictions. This result agrees with the concepts that the major mechanism of current in such one-dimensional wires does not depend on the material inserted into pores, but depends only on the dimension of conducting wires.

Электронный транспорт в нанопроволоках Те

AbstractThe temperature and magnetic field dependences of the voltage-current characteristics of tellurium nanowires manufactured via the insertion of tellurium into chrysotile asbestos pores from a melt have been measured. The measurements have been performed within a broad range of temperatures and magnetic fields. The results of such measurements are analyzed by means of their comparison with the predictions of theoretical models developed for the case of one-dimensional structures. The obtained dependences are concluded to most closely correspond to Luttinger liquid theory predictions. This result agrees with the concepts that the major mechanism of current in such one-dimensional wires does not depend on the material inserted into pores, but depends only on the dimension of conducting wires.

Synthesis of Tellurasila Cycles Containing an Annelated Dicarba‐closo‐dodecaborane(12) Unit: Structure of a 1,4‐Ditellura‐2,3‐disilacyclohexane Derivative

AbstractInsertion of tellurium into C–Li bonds of dilithiated 1,2‐dicarba‐closo‐dodecaborane(12) gave 1,2‐dicarba‐closo‐dodecaborano(12)‐1,2‐ditellurolate [(1,2‐C2B10H10)Te2Li2](Et2O) which, after reaction with 1,2‐dichlorotetramethyldisilane, afforded a six‐membered heterocycle containing the Te–Si–Si–Te unit with an annelated carborane moiety, characterized by multinuclear magnetic resonance and X‐ray structural analysis. As a byproduct, a five‐membered ring containing a Si–Si–Te unit was formed, which was obtained as a major product, using conditions favouring partial insertion of tellurium into C–Li bonds. Treatment of [(1,2‐C2B10H10)Te2Li2](Et2O) with dichlorodimethylsilane led to a five‐membered heterocycle as a major product containing a Te–Te–Si unit. Various decomposition/hydrolysis/oxidation products could be identified by multinuclear magnetic resonance, among them most notably 1,2‐di(hydrotelluro)‐1,2‐dicarba‐closo‐dodecaborane(12).

ChemInform Abstract: Insertion of Tellurium into an Alkylpentacarbonylmanganese Complex and a Convenient New Route to Manganese Telluride.

The reaction between [Mn(Ch2Ph)(CO)5] and TePEt3 results in the insertion of tellurium into the Mn–CH2 bond, producing the first known monomeric σ-bonded alkyltelluriomanganese complex [Mn(TeCH2Ph)(CO)3(PEt3)2]2; pyrolysis of 2 yields polycrystalline manganese telluride.

ChemInform Abstract: New Reagents for the Synthesis of Compounds Containing Metal-Tellurium Bonds: Sterically Hindered Silyltellurolate Derivatives and the X-Ray Crystal Structures of ((THF)2LiTeSi(SiMe3)3)2 and ((12-crown-4)2Li)( TeSi(SiMe3)3).

The synthesis and characterization of several salts of the bulky silyltellurolate ligand TeSi(SiMe 3 ) 3 are reported. Insertion of tellurium into the Li-Si bond of (THF 3 )LiSi(SiMe 3 ) 3 in THF affords colorless crystals of (THF) 2 LiTeSi(SiMe 3 ) 3 (1) in high yield. X-ray diffraction shows 1 to be dmeric in the solid state ; it crystallizes in the space group P2 1 /n.

Molecular Structures of some Tellurium Derivatives of 1,2‐Dicarba‐closo‐dodecaborane(12)

AbstractThe insertion of tellurium into the carbon‐lithium bonds of lithiated ortho‐carborane, C2B10H12, in solution can be used to generate organometallic derivatives with Te2 units.In addition to di(ortho‐carborane‐1‐yl) ditellane, (C2B10H11)2Te2 (2c), two cylic compounds containing each two annellated [(dicarba‐closo‐dodecaborano)] units, (C2B10H10)2Te4 (3c) and (C2B10H10)2Te2(SnMe2) (4c), have been structurally characterized.

Influence of Both Steric Effects and Te···N Intramolecular Nonbonded Interactions on the Stabilization of Organotellurium Compounds Incorporating [2-[1-(3,5-Dimethylphenyl)-2- naphthyl]-4,5-dihydro-4,4-dimethyloxazole

A series of novel low-valent organotellurium compounds incorporating [2-[1-(3,5-dimethylphenyl)-2-naphthyl]-4,5-dihydro-4,4-dimethyloxazole] (1) stabilized by Te···N nonbonded interactions have been synthesized. The synthesis has been achieved by the ortholithium route. The lithium arenetellurolate 3 was obtained by direct metalation of 1 with 1.6 M of n-BuLi in hexane followed by the insertion of tellurium into the Li−C bond. Oxidation of 3 then afforded the desired ditelluride 4. The reaction of 4 with a stoichiometric amount of sulfuryl chloride yielded stable tellurenyl(II) chloride 5, whereas the addition of an excess sulfuryl chloride led to the formation of tellurium(IV) trichloride 6. The stable bromo compound 7 was obtained by the controlled bromination of 4 with bromine. No tellurium tribromide formation was observed when the ditelluride was treated with an excess of bromine. Compound 4 underwent facile reaction with a stoichiometric amount of iodine to give a stable mono iodo compound (8). The ...

Insertion of tellurium into an alkylpentacarbonylmanganese complex and a convenient new route to manganese telluride

The reaction between [Mn(Ch2Ph)(CO)5] and TePEt3 results in the insertion of tellurium into the Mn–CH2 bond, producing the first known monomeric σ-bonded alkyltelluriomanganese complex [Mn(TeCH2Ph)(CO)3(PEt3)2]2; pyrolysis of 2 yields polycrystalline manganese telluride.

Ferrocenylchalkogenide

The very first examples of ferrocenyltellurium compounds are described. Inser-tion of tellurium into ferrocenyllithium led to an intermediate {FcTeLi}, which, upon oxidation in air, gave diferrocenylditelluride, Te 2Fc 2, in 50% yield 1 1 Abkürzungen: Fc = Ferrocenyl, C 5H 5FeC 5H 4-; Ph = Phenyl, C 6H 5-; nBu = n-Butyl, C 4H 9-. . The reaction of Te 2Fc 2 with organolithium compounds, RLi, was used to prepare ferrocenyltellurides FcTeR (R = Fc, nBu, o- and p-Anisyl). Bis(ferrocenyltelluro)-methane, FcTe(CH 2)TeFc, was also obtained. The ferrocenyltellurium compounds were characterized by their 1H and 13C NMR spectra, and the influence of the chalcogen atom upon the chemical shifts was demonstrated for the EFc 2, E 2Fc 2 and FcE(CH 2)EFc(E = S, Se, Te) series.