Solid-state 125Te NMR studies of inorganic compounds containing tellurium in oxidations states ranging from âII to VI have been made. The chemical shift tensors of Te(OH)6, TeCl4, TeO2 and elemental tellurium have been determined by simulation of magic angle spinning (MAS) NMR spectra. Binary transition-metal ditellurides have been studied by MAS and static 125Te NMR techniques. The observed MTe2 NMR shifts range from ca. 500 to 8000 ppm [from aqueous Te(OH)6] and are shown to be correlated with the expected tellurium oxidation state. Separation of the chemical shift and Knight shift contributions has been attempted.
Thermodynamic properties of tungsten ditelluride (WTe2) II. Standard molar enthalpy of formation at the temperature 298.15 K
作者:P.A.G. O'Hare、G.A. Hope
DOI:10.1016/s0021-9614(05)80035-7
日期:1992.6
in high-pressure fluorine: ΔfHom(WTe2, cr, 298.15 K) = −(38±5) kJ · mol−1, and ΔfHom(TeF6, g, 298.15 K) = −(1380.7±1.3) kJ · mol−1. Two hightemperature investigations of the vaporization of WTe2 give derived enthalpies of formation that agree with this result, but which have rather large uncertainties that arise from estimated thermodynamicproperties used in the calculations. The enthalpy of formation
Synthesis and Reactivity of W<sub>3</sub>Te<sub>7</sub><sup>4+</sup> Clusters and Chalcogen Exchange in the M<sub>3</sub>Q<sub>7</sub> (M = Mo, W; Q = S, Se, Te) Cluster Family
作者:Maxim N. Sokolov、Pavel A. Abramov、Artem L. Gushchin、Irina V. Kalinina、Dmitry Y. Naumov、Alexander V. Virovets、Eugenia V. Peresypkina、Cristian Vicent、Rosa Llusar、Vladimir P. Fedin
DOI:10.1021/ic050962c
日期:2005.10.1
Heating WTe(2), Te, and Br(2) at 390 degrees C followed by extraction with KCN gives [W(3)Te(7)(CN)(6)](2-). Crystalstructures of doublesalts Cs(3.5)K[W(3)Te(7)(CN)(6)]Br}Br(1.5).4.5H(2)O (1), Cs(2)K(4)[W(3)Te(7)(CN)(6)](2)Cl}Cl.5H(2)O (2), and (Ph(4)P)(3)[W(3)Te(7)(CN)(6)]Br}.H(2)O (3) reveal short Te(2)...X (X = Cl, Br) contacts. Reaction of polymeric Mo(3)Se(7)Br(4) with KNCSe melt gives [
as-synthesized and exfoliated tellurides were characterized in detail and investigated for potential application in electrocatalysis. The inherent electrochemical activity related to both cation and anion was observed. This is dominantly related to the oxidation tendency of tellurium. The MoTe2 and WTe2 show significantly contrasting properties toward the hydrogen evolution reaction, where MoTe2 shows highly
and high‐quality 2D transitionmetaltellurides are synthesized by the chemical vapor deposition method. The as‐grown WTe2 maintains two different stacking sequences in the bilayer, where the atomic structure of the stacking boundary is revealed by scanning transmission electron microscopy. The low‐temperature transport measurements reveal a novel semimetal‐to‐insulator transition in WTe2 layers and