- Spectroscopic Studies on Matrix-isolated Molybdenum Pentachloride
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Matrix-isolation studies have been carried out on molybdenum petnachloride.In a nitrogen-matrix, prominent i.r. bands are observed at ca. 473 and 408 cm-1, which on the basis of isotope studies are assigned as the A1 (axial and E Mo-Cl stretching modes of monomeric MoCl5 (C4v).Argon matrices yielded essentially the same spectroscopic features.Corresponding u.v.-visible spectra were obtained and assigned on the basis of a square-pyramidal geometry.Attempts to prepare and characterise MoCl6 were unsuccessful.
- Brisdon, Alan K.,Graham, John T.,Hope, Eric G.,Jenkins, Delyth M.,Levason, William,Ogden, J. Steven
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- Improved preparations of molybdenum coordination compounds from tetrachlorobis(diethyl ether)molybdenum(IV)
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The reduction of MoCl5 with metallic tin in diethyl ether provides a rapid and convenient entry to [MoCl4(OEt2)2] This compound can be transformed easily and in high yields into a variety of other useful synthon
- Stoffelbach, Fran?ois,Saurenz, Dirk,Poli, Rinaldo
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p. 2699 - 2703
(2007/10/03)
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- On tetrachlorophosphonium chlorometallates of rhenium and molybdenum: Syntheses, crystal structures, and magnetism of [PCl4]2[Re2Cl10] and [PCl4]3[ReCl6]2, and the magnetic properties of [PCl4]2[Mo2Cl10]
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MoCl4, ReCl4, and ReCl5 react with PCl5 in sealed glass ampoules at temperatures between 220° and 320° to [PCl4]2[Mo2Cl10] (1) [PCl4]2[Re2Cl10] (2), and [PCL4]3[ReCl6]2 (3). 2 crystallizes isotypically to the previously reported 1 and the respective titanium and tin containing analogues. The structure (triclinic, P1 Z = 1, a = 897.3(2), b = 946.0(2), c = 687.13(9) pm, α = 95.59(2)°, β = 95.80(2)°, γ = 101.07(2)°, V = 565.4(2) 106 pm3) is built of tetrahedral [PCl4]+ and edge sharing double octahedral [Re2Cl10]2- ions and can be derived from a hexagonal closest packing of Cl- ions with tetrahedral and octahedral holes partially filled by P(V) and Re(IV), respectively. 3 crystallizes isotypically to [PCL4]3[PCl6][MCl6] (M = Ti, Sn) (tetragonal, P 42/mbc, Z = 4, a = 1496.2(1), c = 1363.2(2) pm). Because no evidence was found for the presence of [PCl6]- ions, Re in 3 has to be of mixed valency with ReIV and ReV sharing the same crystallographic site. The structure can be derived from a cubic closest packing or alternatively from an only sparsely distorted body centered cubic arrangement of Cl- ions which is rarely found for anion arrays. The tetrahedral and octahedral holes are partially filled by PV and MIV/V, respectively. Magnetic measurements show all three compounds to be paramagnetic and confirm the oxidation state IV for Mo and Re in 1 and 2 and the mixed valence (IV/V) for Re in 3.
- Beck,Mueller-Buschbaum,Wolf
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p. 975 - 981
(2008/10/08)
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- The Crystal Structure of Nonachlorodimolybdenum(V) Heptachlorodioxo-dimolybdate(V)
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The compound Mo2Cl8O was formed as a minor product in the reaction of molybdic acid with thionyl chloride.Its structure has been determined by the heavy-atom method from 1265 reflections, measured with a diffractometer, and refined by full-matrix least-squares methods to R 0.066.Crystals are monoclinic, space group P2/c, with a=10.01(1), b=6.27(1), c=17.89(2) Angstroem, β=101.8(3) grad.The structure consists of singly chlorine-bridged, binuclear cations + and triply chlorine-bridged binuclear anions - which are linked into chains by weak interactions through the oxygen atoms.
- Edwards, Anthony J.,Slim, David R.
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p. 485 - 488
(2007/10/02)
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- ANALYSIS OF VARIOUS METAL OXIDE/ORGANOHALIDE-BASED FLAME RETARDANTS.
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The mechanism of evaporation of various metal oxides and the formation and evaporation of metal halides in the presence of chlorine-containing compounds have been studied by complex thermal analysis including atomic absorption measurement of the evolved s
- Simon,Szitanyi,Kantor
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p. 1915 - 1922
(2008/10/08)
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- Preparation et identification des produits de l'interaction Cl2-Mo a haute temperature (870-1160 deg C)
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The products resulting from the chlorine interaction with molybdenum powder in the range from 870 deg C to 1160 deg C, have been observed in the experimental conditions allowing to obtain eventually molybdenum coatings by means of chemical deposition of v
- Mezin, A.,Lepage, J.,Paulmier, D.
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p. 660 - 663
(2007/10/02)
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