10049-12-4Relevant articles and documents
Synthesis, structure, and magnetic properties of compounds NaMIIZr2F11 (MII = Ti, V, Cu) and a notice on NaPdZr2F11
Bialowons,Müller
, p. 1187 - 1194 (1996)
By synthesizing NaTiZr2F11 in form of red single crystals, it was possible to obtain a complex fluoride with Ti2+ for the first time. It crystallizes like the analogous greenish blue vanadium compound isotypic to AgPdZr2F11 [1] monoclinic, spacegroup C2/m-C2h3 (No. 12) with a = 918.0/911.5 pm, b = 682.6/675.7 pm, c = 780.8/776.6 pm, β = 116.2/116.2° and Z = 2. Colourless NaCuZr2F11 however crystallizes as a result of the Jahn-Teller distortion of Cu2+ triclinic (space group P1-Ci1 (No. 2), a = 552.7 pm, b = 568.2 pm, c = 768.0 pm, α = 111.0°, β = 97.4°, γ = 106.4°) and is - as expected - isotypic to NaAgZr2F11 [1]. Johann Ambrosius Earth 1996.
(H2O)[V2III F6] and Pyr-VF3:Hydrothermal synthesis, structure determination, and magnetic characterization of new fluorides with the pyrochlore type
Barthelet, Karin,Marrot, Jerome,Riou, Didier,Ferey, Gerard
, p. 266 - 269 (2001)
Small green triangular crystals of a new tridimensional hydrated vanadium(III) fluoride have been hydrothermally prepared in a simple way by heating a mixture of V:HF:H2O in the molar ratio 1:1:50 at 200°C for 3 days. Its structure was solved by X-ray diffraction in the cubic space group Fd3m (No. 227) with a = 10.4636(2)A. (H2O)[V2IIIF6] presents the structure of the well-known pyrochlore type. The cavities contain water molecules which are lost by heating (T 3 (Pyr-VF3) with the pyrochlore structure is compared to that of the already known Pyr-FeF3 (1). The magnetic behavior of Pyr-VF3 is described.
The crystal structures of the vanadium weberites Na2MIIVIIIF7 (MII = Mn, Ni, Cu) and of NaVF4
Peschel,Babel
, p. 1614 - 1620 (1997)
At single crystals of the vanadium(III) compounds NaVF4 (a = 790.1, b = 531.7, c = 754.0 pm, β = 101.7°; P21/c, Z = 4), Na2NiVF7 (a = 726.0, b = 1031.9, c = 744.6 pm; Imma, Z = 4) and Na2CuVF7 (a = 717.6, b = 1043.5, c = 754.6 pm; Pmnb, Z = 4) X-ray structure determinations were performed, at Na2MnVF7 (a = 746.7, c = 1821.6 pm; P3221, Z = 6) a new refinement. NaVF4 crystallizes in the layer structure type of NaNbO2F2. The fluorides Na2MIIVF7 represent new orthorhombic (MII = Ni; Cu) resp. trigonal (MII = Mn) weberites. The average distances within the [VF6] octahedra of the four compounds are in good agreement with each other and with data of related fluorides (V-F: 193.3 pm). The differences between mean bond lengths of terminal and bridging F ligands are 5% in NaVF4, but less than 1% in the weberites. Details and data for comparison are discussed.
Demsar, A.,Bukovec, P.
, p. 247 - 250 (1988)
Emeleus, H. J.,Gutmann, V.
, (1949)
Decomposition of dichlorodifluoromethane with simultaneous halogen fixation by vanadium oxide supported on magnesium oxide
Tamai, Tsukasa,Inazu, Koji,Aika, Ken-Ichi
, p. 1565 - 1574 (2007/10/03)
Dichlorodifluoromethane (CCl2F2, 1% in He) decomposition with simultaneous halogen fixation by vanadium oxide supported on magnesium oxide was studied at 723 K in a flow apparatus. The pretreatment condition and vanadium loading of supported vanadium oxide samples affected the CCl2F2 decomposition efficiency. Through characterization studies (XRD, IR, Raman, and XPS) and reference experiments, Mg 3(VO4)2 was revealed to be the active species to initiate CCl2F2 decomposition, leading to MgF 2, MgCl2, and CO2 formation. The model experiments also suggested a detailed mechanism that VOCl3 was formed from Mg3(VO4)2 by a reaction with CCl 2F2 or the major intermediate compound CCl4, and that VOCl3 reacted with MgO to regenerate Mg3(VO 4)2 and to promote chlorine fixation as MgCl2.
New Fluorozirconates and -hafnates with V2+ and Ti2+
Schmidt,Kraus,Mueller
, p. 2344 - 2350 (2008/10/08)
During investigations of the systems MF2/KF/MF4 e.g. MF2/NaF/MF4 (M2+ = Ti2+, V2+, M4+= Zr4+ Hf4+) we obtained blue crystals of VZrF6, VHfF6, KVZrF7, blue-green crystals of NaVHf2F11, yellow crystals of TiHfF6 and NaTiHf2F11, and yellow to rubyred crystals of TiZrF6, respectively. According to single crystal data, VZrF6 VHfF6 and TiZrF6 crystalizes in the ordered ReO3-type (cubic, Fm3m, a = 812,1(5), 804,2(8), and 821,0(2) pm, Z = 4). TiHfF6 crystalizes in a high-temperature-modification (cubic, ReO3-type, Pm3m, a = 392,3(2) pm, Z = 2). KVZrF7 is isotyic to KPdZrF7 (orthorhombic, Pnna, a = 1109,8(6), b = 788,0(7), c = 648,0(15) pm, Z = 4). NaTiHf2F11 and NaVHf2F11 crystalizes monoclinic (C2/m, a = 910,5(7), b = 675,9(7), c = 773,6(5) pm, β= 116,10(6)° and a = 917,7(5), b = 685,7(5), c = 752,4 pm, β= 118,28(1)°, Z = 2, respectively) and are also isotypic to already known AgPdZr2F11. WILEY-VCH Verlag GmbH, D-69451 Weinheim, 2001.