12608-26-3Relevant articles and documents
Electronic Structure Considerations for Methane Activation by Third-Row Transition-Metal Ions
Irikura, Karl K.,Beauchamp, J. L.
, p. 8344 - 8351 (1991)
Methane is spontaneously dehydrogenated in the gas phase by many metal ions of the 5d transition series.In most cases, the MCH2+ produced undergoes further reactions, leading eventually to products such as WC8H16+.The reactivity of the third-row transitio
High-Pressure Phases in the System W-O. I. Structure of WO1.09 by HRTEM
Barabanenkov, Yu. A.,Zakharov, N. D.,Zibrov, I. P.,Filonenko, V. P.,Werner, P.
, p. 572 - 577 (1992)
A new type of tungsten oxide was synthesized from a mixture of W and WO3 by a solid-phase sintering method under high-pressure conditions.The crystal structure of the new oxide WO1.09 was investigated by selected-area electron diffraction and high-resolution transmission electron microscopy (HRTEM).It has the following unit-cell parameters: a=17.16, b=10.32, c=3.78 Angstroem, V=669 Angstroem3, Z=44, ρ=21 (3) g cm-3, and belongs to the space group Cmm2.The W positions were determined from computer-processed HRTEM structure images.The R-factor minimization procedure was used to refine cationic sites; R'=14.5percent.It is shown that the crystal structure is formed by edge sharing WO3 octahedrally and tetrahedrally coordinated W cations.
Heavy water reactions with atomic transition-metal and main-group cations: Gas phase room-temperature kinetics and periodicities in reactivity
Cheng, Ping,Koyanagi, Gregory K.,Bohme, Diethard K.
, p. 8561 - 8573 (2008/10/09)
Reactions of heavy water, D2O, have been measured with 46 atomic metal cations at room temperature in a helium bath gas at 0.35 Torr using an inductively coupled plasma/selected ion flow tube tandem mass spectrometer. The atomic cations were produced at ca. 5500 K in an ICP source and were allowed to decay radiatively and thermalize by collisions with Ar and He atoms prior to reaction. Rate coefficients and product distributions are reported for the reactions of fourth-row atomic cations from K+ to Se+, of fifth-row atomic cations from Rb+ to Te+ (excluding Tc+), and of sixth-row atomic cations from Cs+ to Bi +. Primary reaction channels were observed leading to O-atom transfer, OD transfer, and D2O addition. O-Atom transfer occurs almost exclusively (≥90%) in the reactions with most early transition-metal cations (Sc+, Ti+, V+, Y+, Zr +, Nb+, Mo+, Hf+, Ta+, and W+) and to a minor extent (10%) with one main-group cation (As+). OD transfer is observed to occur only with three cations (Sr+, Ba+, and La+). Other cations, including most late transition and main-group cations, were observed to react with D 2O exclusively and slowly by D2O addition or not at all. O-Atom transfer proceeds with rate coefficients in the range of 8.1 × 10-13 (As+) to 9.5 × 10-10 (Y +) cm3 molecule-1 s-1 and with efficiencies below 0.1 and even below 0.01 for the fourth-row atomic cations V+ (0.0032) and As+ (0.0036). These low efficiencies can be understood in terms of the change in spin required to proceed from the reactant to the product potential energy surfaces. Higher order reactions are also measured. The primary products, NbO+, TaO+, MoO +, and WO+, are observed to react further with D 2O by O-atom transfer, and ZrO+ and HfO+ react further through OD group abstraction. Up to five D2O molecules were observed to add sequentially to selected M+ and MO+ as well as MO2+ cations and four to MO2D +. Equilibrium measurements for sequential D2O addition to M+ are also reported. The periodic variation in the efficiency (k/kc) of the first addition of D2O appears to be similar to the periodic variation in the standard free energy (ΔG°) of hydration.
Activation of CO2 by laser-ablated group 6 metal atoms
Souter, Philip F.,Andrews, Lester
, p. 777 - 778 (2007/10/03)
The primary reaction products of laser-ablated group 6 atoms with CO2 prove to be the insertion products OMCO and O2M(CO)2 (M = Cr, Mo, W) which are isolated in argon matrices and identified by the effects of isotopic subs
