- Spectres de vibration de composes MIIMo6X14
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Infrared and Raman spectra of compounds MIIMo6X14 with MII = Fe, Cd, Pb and X = Cl or Br were recorded in the solid state and interpreted.It was shown that if the highest infrared frequency depends only of the nature of X, the other
- Zelverte, A.,Mancour, S.,Caillet, P.
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- Formation of Molybdenum-bearing Ferrites, Fe(3-x)MoxO4 (x= 0.04-0.19), in Aqueous Suspension by Air Oxidation
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Molybdenum-bearing ferrites (Mo:Fetot. mol ratios 0.015-0.069:1) have been formed by air oxidation of iron(II) hydroxide suspensions, which were prepared in the presence of Mo(III) ions, at Mo:Fetot. mol ratios of 0.032-0.0326:1 in t
- Kanzaki, Tadao,Furukawa, Haruhiko,Katsura, Takashi
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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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- Polycationic Hg-As frameworks with trapped anions. II [1] synthesis, crystal structure, and magnetism of (Hg6As4)[MoCl6]Cl, (Hg6As4)[Ticl6]Cl, and (Hg6As4)[TiBr6]Br
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(Hg6As4)[MoCl6]Cl is obtained by reaction of Hg2Cl2, Hg, As, and MoCl4 in closed, evacuated glass ampoules in a temperature gradient 450 → 400°C in form of dark red cubelike crystals. (Hg6As4)[TiCl6]Cl and (Hg6As4)[TiBr6]Br are also formed in closed, evacuated ampoules from Hg2X2 (X = Cl, Br), Hg, As, and Ti metal at 275°C and 245°C in form of dark green and black crystals, respectively. All three compounds are air and light sensitive. They crystallize isotypically (cubic, Pa 3, a = 1207.8(4) pm for (Hg6As4)[MoCl6]Cl, a = 1209.4(3) pm for (Hg6As4)[TiCl6]Cl, a = 1230.9(3) pm for (Hg6As4)[TiBr6]Br, Z = 4). The structures consist of a three-dimensionally connected Hg-As framework which is made up of As2 groups (As-As distance averaged 242 pm) each connected via six Hg atoms to six neighbouring As2 groups. There are two cavities of different size in the polycationic framework. The bigger cavity is filled with [MoCl6]3-, [TiCl6]3-, and [TiBr6]3- ions of nearly ideal octahedral shape, the smaller cavity with discrete halide ions. The magnetic properties of the two Ti containing compounds are in accordance with a d1 paramagnetism. The temperature dependence and the magnitude of the magnetic moment can be interpreted with consideration of the spin-orbit coupling. The so far known representatives of this structure type can be characterised by the ionic formula (Hg6Y4)4+[MX6]3-X - (Y = As, Sb; M = Sb3+, Bi3+, Mo3+, Ti3+; X = Cl, Br).
- Beck, Johannes,Neisel, Udo
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p. 1620 - 1626
(2008/10/08)
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- Ternary molybdenum(III) chlorides
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The phase diagrams of ACl/MoCl3 (A = Na, K, Rb, Cs) were elucidated by DTA measurements in sealed quartz ampoules in the range of 0-40 mol% MoCl3. The samples were prepared from alkali metal chlorides and the compounds A3MoCl6 or A3Mo2Cl9. The 3:1 compounds with A = Na, Rb, Cs were obtained by sintering mixtures of 3ACl+MoCl3; the enneachlorides A3Mo2Cl9 with A = K, Rb, Cs were precipitated from solutions of MoCl3·3H2O and ACl in formic acid. Congruently melting compounds A3MoCl6 exist in all four systems, incongruently melting enneachlorides A3Mo2Cl9 in systems with A = K, Rb, Cs. Still unknown structures were determined by analog-indexing powder patterns according to known structure families. Especially Cs3MoCl6 is isotypic with the recently found Cs3CrCl6 structure. Additionally, the unit cell parameters were determined for the compounds A3MoCl5·H2O (A = K, Rb, Cs) analogous to Cs2TiCl5·H2O, whose structure was determined by single crystal measurements.
- Beier,Seifert
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