cas 10049-12-4, VANADIUM TRIFLUORIDE | Articles data

Articles about 10049-12-4Total 14 be found

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Synthesis, structure, and magnetic properties of compounds NaMIIZr2F11 (MII = Ti, V, Cu) and a notice on NaPdZr2F11
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.
Bialowons,Müller
p. 1187 - 1194
(1996)
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Thermal dehydration of the fluoride hydrates FeMIIIF5·7H2O (MIII = Al, Fe, V, Cr)
The thermal dehydration of the fluoride hydrates FeAlF5·7H2O, Fe2F5·7H2O, FeVF5·7H2O and FeCrF5·7H2O has been investigated by thermoanalytical, X-ray and i.
Bentrup
p. 397 - 406
(1996)
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(H2O)[V2III F6] and Pyr-VF3:Hydrothermal synthesis, structure determination, and magnetic characterization of new fluorides with the pyrochlore type
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.
Barthelet, Karin,Marrot, Jerome,Riou, Didier,Ferey, Gerard
p. 266 - 269
(2001)
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Structural and magnetochemical studies of SrVF5
Single crystals of SrVF5 were obtained by heating a mixture of the component fluorides at 850°C for 5 d (a = 707.2(1), b = 727.1(1), c = 1471.4(2) pm, β = 94.96(1)°; space group P21/c, Z = 8). The X-ray structure determination confirmed its helical SrFeF5 type of chain structure, in which the octahedra sharing cis corners are considerably distorted (average V-F: 193,7 pm). The compound is weakly antiferromagnetic; there is indication of three-dimensional ordering only at the lowest temperature measured (TN ≈ 2 K). The flat susceptibility maximum near 6 K is attributed to lowdimensional preordering. As studied at a single crystal the behaviour is anisotropic, indicating spin orientation about along [100], normal to the chain axis [010].
Graulich,Babel
p. 1223 - 1228
(2003)
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The crystal structures of the vanadium weberites Na2MIIVIIIF7 (MII = Mn, Ni, Cu) and of NaVF4
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.
Peschel,Babel
p. 1614 - 1620
(1997)
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SENSITIZED LUMINESCENCE OF VF5 UNDER THE ACTION OF THE EMISSION OF A PULSED CO2 LASER.
Study of sensitized visible luminescence of VF//5, which accompanies its dissociation, under the action of emission from a pulsed CO//2 laser is described.
Klimov,Kuz'menko,Legasov,Udalova
p. 586 - 589
(1980)
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Cooperative radiative and nonradiative effects in K2NaScF6 codoped with V3+ and Er3+.
K2NaScF6 crystals codoped with V3+ and Er3+ exhibit some novel cooperative near-IR to visible upconversion processes at cryogenic temperatures. V3+ mainly acts as a broadband sensitizer. The V3+ 3T1g --> 3T2g excitation between 13,500 and 15,500 cm(-1), after fast relaxation to V3+ 1T2g, can be transferred to Er3+ 4I(11/2), and then upconversion takes place. Four upconversion mechanisms are identified and characterized. For narrow-band laser excitation the overall efficiency of the upconversion processes is low. However, at 12 K for broadband excitation, such as in a lamp, between 12,000 and 14,500 cm(-1) the number of emitted visible photons is roughly doubled by codoping V3+ in addition to Er3+. Copyright 2004 American Institute of Physics
Reinhard, Christine,Kramer, Karl,Biner, Daniel A,Gudel, Hans U
p. 3374 - 3380
(2004)
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Decomposition of dichlorodifluoromethane with simultaneous halogen fixation by vanadium oxide supported on magnesium oxide
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.
Tamai, Tsukasa,Inazu, Koji,Aika, Ken-Ichi
p. 1565 - 1574
(2007/10/03)

Reactivity of Tin Difluoride
A new value of the enthalpy of formation of tin difluoride was used to calculate the thermodynamic parameters of reactions of SnF2 with elemental substances and several metal oxides. SnF2 can act as an oxidizer and is useful for the synthesis of higher fluorides of group III-V transition metals, including those that have previously been prepared only by reactions with elemental fluorine (TiF4, NbF5, TaF5). The fact that such reactions occur was verified experimentally.
Goryacheva,Rakov,Solov'ev
p. 949 - 952
(2008/10/08)

New Fluorozirconates and -hafnates with V2+ and Ti2+
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.
Schmidt,Kraus,Mueller
p. 2344 - 2350
(2008/10/08)

Structural and magnetochemical studies of Ba5Mn3F19 and related compounds AII5MIII3F19
Single crystal structure determinations by X-ray methods were performed at the following compounds, crystallizing tetragonally body-centred (Z = 4): Sr5V3F19 (a = 1423.4(2), c = 728.9(1) pm), Sr5Cr3F19 (a = 1423.5(2), c = 728.1(1) pm), Ba5Mn3F19 (a =1468.9(1), c =770.3(1) pm, Ba5Fe3F19 (a =1483.5(1), c =766.7 (1) pm), and Ba5Ga3F19 (a = 1466.0(2), c = 760.1(2) pm). Only Ba5Mn3F19 was refined in space group I4cm (mean distances for elongated octahedra Mn1-F: 185/207pm equatorial/axial; for compressed octahedra Mn2-F: 199/182 pm), the remaining compounds in space group I4/m. In all cases the octahedral ligand spheres of the M1 atoms showed disorder, the [M1F6] octahedra being connected into chains in one part of the compounds and into dimers in the other. The magnetic properties of the V, Cr and Mn compounds named above and of Pb5Mn3F19 and Sr5Fe3F19 as well were studied; the results are discussed in context with the in part problematic structures.
Dahlke,Graulich,Welsch,Pebler,Babel
p. 1255 - 1263
(2008/10/08)

Synthesis, thermal decomposition and infrared spectra of two new hydrazinium (1+) fluorovanadates(III), (N2H5)2VF5·H2O and (N2H5)2VF5
Thermal decomposition of a new compound, (N2H5)2VF5·H2O, prepared from aqueous solutions, gives in inert atmosphere at 93°C the new compound (N2H5)2VF5. The decomposition proceeds further over intermediates, N2H5VF4 at 236°C and NH4VF4 at 268°C, to the impure VF3 at 615°C. According to the infrared spectra there are weak hydrogen bonds in all nitrogen compounds. There are different types of N2H+5 cations in (N2H5)2VF5·H2O and (N2H5)2VF5. In N2H5VF4, the cation is coordinated over the lone pair of the vanadium atom. By analogy with the spectra of similar compounds, isolated octahedra [VF5·H2O]2- appear in the structure of (N2H5)2VF5·H2O and fluorine-bridged chains of [VF4F2/2] octahedra in [N2H5]2VF5.
Rahten,Milicev
p. 137 - 141
(2008/10/09)

Crystal Structure Determinations of Four Monoclinic Weberites Na2M(II)M(III)F7 (M(II)=Fe, Co; M(III)=V, Cr)
By solid state reaction of the binary fluorides single crystals of the following weberites were prepared and their monoclinic structure (space group C2/C, Z=16) determined by X-ray methods: Na2FeVF7 (a=1271.0(3), b=742.9(1), c=2471.6(5) pm, β=100.03(3)°; R1=0.043 (1545 Reflexe); Fe-F=203.8, V-F 193.0 pm); Na2FeCrF7 (a=1262.5(3), b=739.1(1), c=2460.5(5) pm, β=99.93(3)°; R1=0.029 (2340); Fe-F=203.6, Cr-F=190.5 pm); Na2CoVF7 (a=1270.3(5), b=739.1(3), c=2465(10) pm, β=100.02(3)°; R1=0.028 (2250); Co-F=201.6, V-F=193.6 pm); Na2CoCrF7 (a=1257.8(3), b=733.5(1), c=2441.5(50 pm, β=99.64(3)°; R1=0.030 (2227); Co-F=201.2, Cr-F=190.2 pm). Concerning the above average distances within the distorted [MF6] octahedra and the shape of [NaF8] coordination details are given and discussed.
Peschel, B.,Molinier, M.,Babel, D.
(2008/10/08)

High Oxidation State Binary Transition Metal Fluorides as Selective Fluorinating Agents
High oxidation state transition metal fluorides are selective fluorinating agents for dichloromethane, those with d0 electronic configurations undergo hydrogen-fluorine exchange and metal reduction, while dn species undergo chlorine-
Dukat, Wolfgang W.,Holloway, John H.,Hope, Eric G.,Rieland, Matthias R.,Townson, Paul J.,Powell, Richard L.
p. 1429 - 1430
(2007/10/02)

Chemical Properties

Melting Point: 140°C
Boiling Point: °Cat760mmHg
Flash Point:°C
Density: g/cm³
Sensitive: Moisture Sensitive
Merck: 14,9922
PSA: 0.00000
LogP: 1.26060

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10049-12-4

Articles about 10049-12-4Total 14 be found

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Chemical Properties

Melting Point: 140°C

Boiling Point: °Cat760mmHg

Flash Point:°C

Density: g/cm³

Sensitive: Moisture Sensitive

Merck: 14,9922

PSA: 0.00000

LogP: 1.26060

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Article Database

10049-12-4

Articles about 10049-12-4Total 14 be found

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Chemical Properties

Melting Point: 140°C

Boiling Point: °Cat760mmHg

Flash Point:°C

Density: g/cm3

Sensitive: Moisture Sensitive

Merck: 14,9922

PSA: 0.00000

LogP: 1.26060

Global suppliers and manufacturers of 10049-12-4total 17 suppliers on LookChem

Density: g/cm³