- Thermal behavior of ammonium-containing titanium and germanium fluoride complexes (NH4)4Li2(AF6)3 and NH4NaAF6 (A = Ge or Ti)
-
The compounds (NH4)4Li2A3F 18 and NH4NaAF6 (A = Ge or Ti) were studied thermogravimetrically. These fluoro complexes are thermolyzed in the range 230-450°C. Measurements on a differential scanning microcalorimeter revealed reversible phase transitions in NH4NaAF6 at T 1 = 126°C and T 2 = 111°C.
- Antokhina,Flerov,Savchenko,Kaidalova,Merkulov,Ignat'eva,Fokina
-
-
Read Online
- New Derivatives of Tetrahydroborate(1-), BH3SiF3- and BH2(SiF3)2-
-
Silicon tetrafluoride and tetrabutylammonium (TBA) tetrahydroborate react in methylene chloride solution to produce and .
- Brownstein, Sydney
-
-
Read Online
- Determination of impurities in germanium tetrafluoride by IR spectroscopy and gas chromatography
-
Using high-resolution Fourier-transform IR spectroscopy and gas chromatography, we have identified more than 20 impurity species, in concentrations from 10-1 to 10-5 vol %, in GeF4 samples of different isotopic composition
- Sennikov,Bulanov,Krylov,Sorochkina
-
-
Read Online
- The Influence of the Counterions [AsF6]– and [GeF6]2– on the Structure of the [ClSO2NH3]+ Cation
-
Chlorosulfonamide reacts in the superacidic solutions HF/GeF4 and HF/AsF5 under the formation of ([ClSO2NH3]+)2[GeF6]2– and [ClSO2NH3]+/sup
- Leitz, Dominik,Stierstorfer, Karin,Morgenstern, Yvonne,Zischka, Florian,Kornath, Andreas J.
-
p. 483 - 488
(2018/05/14)
-
- Industrial fluorine compounds
-
Technological research in the area of the industrial fluorine-containing compounds: ozone safe fluorocarbons (freons), fluoro-olefins, compounds with the functional groups, thermoresistant liquids, oils, lubricants, fluorine surfactants and other.
- Barabanov,Maksimov
-
p. 1133 - 1141
(2009/12/01)
-
- Fluorination of germanium concentrates with ammonium fluorides
-
New method for processing of germanium-containing raw materials to obtain germanium oxide was suggested and studied. The method is based on the fluorination of germanium-containing raw materials with ammonium fluorides, followed by a sublimation isolation of ammonium hexafluorogermanate, its dissolution, and precipitation of germanium oxide from solution. The thermodynamics of the process was calculated and its thermogravimetric analysis was made. The kinetics of germanium oxide fluorination by ammonium hydrodifluoride was experimentally studied. A technological scheme for processing of germanium-containing raw materials with ammonium fluoride was suggested.
- D'yachenko,Kraidenko
-
p. 952 - 955
(2008/12/22)
-
- About the new mixed valent Ge7F16: [GeF6]2- octahedra between [Ge6F10]2+ sheets - A contribution to the stereochemical activity of lone pairs
-
For the first time Ge7F16 colourless transparent single crystals have been prepared by the reduction of GeF4 with Ge at 300°C. The extremely hygroscopic fluoride crystallizes in a new structure type in Cc with a = 1818.0(6) pm, b = 754.3(2) pm, c = 1030.4(3) pm, β = 90.33(3)° und Z = 4. Ge7F16 is a mixed valent fluoride according to 6GeF2×GeF4. Characteristical building units of the new structure type are [Ge6F10]2+ sheets, which are connected via [GeF6]2- octahedra. The Ge2+ within the sheets are coordinated by three nearest F- with distances of 183-218 pm and together with these form distorted trigonal pyramids. The structure of Ge7F16 can be considered as a member of the homologues series Gem4+Gen2+F4m+2n with m = 1 and n = 6. Bond order summations, band structure calculations and calculations of the Madelung part of the lattice energy, MAPLE, have been used for the discussion of the bonding situation.
- Koehler,Chang
-
p. 596 - 602
(2008/10/09)
-
- Matrix Reactions of SiH4 and GeH4 with F2. Infrared Spectra of Several HF Product Complexes
-
Silane and germane were condensed with F2 at high dilution in argon on a 13 +/- 1 K substrate.Weak product complexes produced on condensation and increased by ultraviolet photolysis are assigned to SiH3F..HF, SiH2..HF or SiH2..(HF)2, and HSiF..HF.Annealing produced new bands due to F atom reactions that are attributed to SiH3..HF.The GeH3F molecule was observed in the similar GeH3F..HF complex.H-F vibrations in these complexes suggest that F is more basic in GeH3F than in SiH3F owing to the more electropositive nature of germanium as compared to silicon.
- McInnis, Thomas C.,Andrews, Lester
-
p. 5276 - 5284
(2007/10/02)
-
- Thermochemistry of germanium monoselenide, and the Ge-Se bond dissociation enthalpy
-
The standard molar enthalpy of formation ΔfH0m of GeSe(cr) has been determined by fluorine-combustion calorimetry to be -(51.4 +/- 1.5) kJ * mol-1 at T = 298.15 K and p0 = 101.325 kPa.Combination of t
- O'Hare, P. A. G.,Susman, S.,Volin, K. J.
-
p. 827 - 836
(2007/10/02)
-
- Crystal Structure of GeF//4.
-
GeF//4 has been prepared by heating BaGeF//6 at 600 degree C under a pressure of 10** minus **3 Torr and has been solidified by cooling with liquid nitrogen in a quartz ampoule. A small amount was sealed in a quartz capillary and it was shown that a single crystal could be grown from the gas phase on a four-circle diffractometer at minus 30 degree C. The crystal structure and the calculated Madelung part of lattice energy (MAPLE) are discussed.
- Koehler, J.,Simon, A.,Hoppe, R.
-
p. 333 - 341
(2008/10/08)
-
- Structural studies of salts of cis and trans μ-fluoro-bridged polymers of GeF5- and of the GeF5- monomer
-
XeF5+GeF5- is orthorhombic, and at 20°C a0 = 7.119 (2) A?, b0 = 12.986 (4) A?, c0 = 7.398 (1) A?, and V = 683.9 (5) A?3; Z = 4, and the space group is Pmnb (a nonstandard setting of Pnma, No. 62). From 437 independent X-ray diffraction data, the structure was refined to a weighted R of 0.018 (unweighted R = 0.021) with a standard deviation in an observation of unit weight of 0.725. The structure contains infinite chains of GeF6 octahedra sharing trans vertices. The XeF5 cations are arranged alternately to left and right along the chain such that each cation approaches symmetrically two of the μ-fluoro-bridged GeF6 units. The nonbridging GeF4 units are planar and approximately square, with Ge-F = 1.75 (2) A?. The μ-bridging Ge-F distance is 1.890 (1) A?. ClO2+GeF5- is orthorhombic, and at -105 ± 10°C a0 = 14.648 (2) A?, b0 = 7.576 (1) A?, c0 = 8.894 (2) A?, and V = 987.0 (4) A?3; Z = 8, and the space group is C2221 (No. 20). From 645 independent X-ray diffraction intensity data, refinement led to convergence with a weighted R factor of 0.068 (unweighted R = 0.059) and a standard deviation in an observation of unit weight of 3.938. In the structure, infinite chains of approximately octahedral GeF6 units are joined by sharing cis vertices. This is an infinite helix having all Ge atoms of the chain nearly coplanar. The nonbridging Ge-F distances are in two sets, the shorter (Ge-F = 1.737 (4) and 1.728 (3) A?) being cis to the bridging Ge-F bonds and the longer (Ge-F = 1.776 (3) and 1.768 (3) A?) being trans to the Ge-F bridging. The two μ-bridging Ge-F distances are not significantly different, at 1.887 (1) A?. The anion chains are held together by interactions with the cations. There are two crystallographically distinguishable ClO2+ units. Each lies on a twofold axis, and the closest cation to anion contacts (C11-F1 = 2.539 (3) A?; C12-F4 = 2.625 (3) A?) involve approach of F to Cl normal to the ClO2 triangle. Infrared and Raman spectra of the XeF5+GeF5- and ClO2+GeF5- salts have been assigned. Similarities of the vibrational spectra of the latter to the spectra of the O2+ salt indicate that the same anion occurs in both. The vibrational data show that a third oligomeric form of the anion must occur in the NO2+, NF4+, and SF3+ salts. The tetrabutylammonium salt contains a monomeric anion of approximately D3h symmetry.
- Mallouk, Thomas E.,Desbat, Bernard,Bartlett, Neil
-
p. 3160 - 3166
(2008/10/08)
-