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1Author    AliciaCristina Gonzalez, HansJoachim SchumacherRequires cookie*
 Title    The Kinetics and the Mechanism of the Thermal Reaction between Sulfurtetrafluoride and Fluorine  
 Abstract    The kinetics of the thermal reaction between SF4 and F2 has been investigated between — 2.4 °C and + 24.0 °C, SFe and very small amounts of S2F10 being the only products. The reaction is a chain reaction of medium length. Total pressure and surface have only insignificant influence. The reaction rate follows the equation: d [SF4] _ d[Fd dBM dt dt 1 dt 
  Reference    Z. Naturforsch. 36b, 1381—1385 (1981); received May 7 1981 
  Published    1981 
  Keywords    Kinetics, Sulfurtetrafluoride, Fluorine 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1381.pdf 
 Identifier    ZNB-1981-36b-1381 
 Volume    36 
2Author    H. Erbert, W. Roesky, Mathias Noltem, GeorgeM. SheldrickRequires cookie*
 Title    Synthese und Struktur des Trifluoracetyldicyanomethanids Synthesis and Structure of Trifluoroacetyldicyanom ethanide  
 Abstract    A suspension of NaCN in CH3CN was treated with excess of C2F4. The resulting red solution was evaporated to dryness and a red amorphous solid remained. One part of this solid was dissolved in water and a solution of Ph4AsCl was added. During the work-up procedure two salts were isolated, yellow [Ph4A s'][C F 3C (0)C (C N)2~] l a and red [Ph4A s+][(NC)2CC(CN)C(F)NC(CN)2_] 2a. The products were characterized on the basis of field desorption mass spectroscopy for positive and negative ions, l a was further characterized by an X-ray single crystal investigation. 
  Reference    Z. Naturforsch. 40b, 883 (1985); eingegangen am 7. März 1985 
  Published    1985 
  Keywords    X-Ray, Carbanion, Fluorine, Nitrile 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0883.pdf 
 Identifier    ZNB-1985-40b-0883 
 Volume    40 
3Author    H.-R Blank, M. Frank, J. Heindl, M. Kaltenhäuser, H. Köchner, W. Kreische, N. Müller, S. Porscher, T. WagnerRequires cookie*
 Title    A Simple Model to Explain 19 F-TDPAD Amplitude Characteristics  
 Abstract    Since many years the 19 F-TDPAD method (TDPAD = time differential perturbed angular distri-bution) has been used to investigate electric field gradients in fluorine compounds. In these experi-ments always a strong reduction of the observed interaction amplitudes is observed. To explain these characteristics, a simple kinematic model is suggested. 
  Reference    Z. Naturforsch. 47a, 389—394 (1992); received July 29 1991 
  Published    1992 
  Keywords    TDPAD, Quadrupole interaction, Fluorine, Perturbation amplitude, Temperature dependence 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0389.pdf 
 Identifier    ZNA-1992-47a-0389 
 Volume    47 
4Author    L. G. Petersson, G. Frostell, Sweden, A. LoddingRequires cookie*
 Title    Secondary Ion Microanalysis of Fluorine in Apatites of Biological Interest  
 Abstract    A Cameca IM S 300 ion analyzer has been used to measure fluorine concentrations in tooth material. Samples of human and shark teeth were studied. Negative oxygen primary ions produce secondary mass spectra in which positive as well as negative fluorine ion peaks are well re­ presented. W ith constant measuring conditions, the reproducibility of the F/Ca ion ratios is satis­ factory. Fluorine concentrations in the 10 ppm region are easily recorded. By means of samples previously measured by macroscopic F-determining methods, a calibration can be effected to ob­ tain, from the ion current ratios, at least semiquantitative values of F-concentrations. In a sample of human enamel, the F-concentration was found to vary from about 3000 ppm at the surface to about 100 ppm in the interior. In shark enamel the composition at the surface cor­ responded to nearly saturated fluorapatite, 3.6% F, but the fluorine concentration decreased distinctly at increasing depth. 
  Reference    (Z. Naturforsch. 29c, 417 [1974]; received February 18 1974) 
  Published    1974 
  Keywords    Microanalysis, Fluorine, Teeth, Apatites, Ion Microprobe 
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 TEI-XML for    default:Reihe_C/29/ZNC-1974-29c-0417.pdf 
 Identifier    ZNC-1974-29c-0417 
 Volume    29 
5Author    Eberhard JacobRequires cookie*
 Title    Chemisches Verhalten des SUiziumoxidfluorids F3SiOSiF3 Chemical Behaviour of the Silicon Oxide Fluoride F3SiOSiF3  
 Abstract    The stability of (SiF3)20 and the chemical behaviour with HF and CsF has been described. The reactivity of hexafluorodisiloxane with various strongly oxidizing fluorides (XeF6, and oxide fluorides (XeOF4, C102F) was investigated, particularly with respect to the preparation of oxide fluorides such as XeF6 + (SiF3)20 XeOF4 + 2 SiF4(I) in comparison to hydrolysis reactions with H20 or Si02/HF. In summary, all the studied compound react more slowly with (SiF3)20 than with H20. The reaction (1) can be re-commended as a safe procedure to prepare XeOF4. By heating a mixture of UFÖ and (SiF3)20 uranium oxide fluorides are obtained. With UV irradiation /S-UF5 was observed. It is remarkable that many of the investigated fluorides and fluorine oxidize the (SiF3)20 to oxygen. (SiF3)20 shows no reaction with HF. IF7 catalyzes only the decomposition of (SiF3)20. 
  Reference    Z. Naturforsch. 35b, 1088—1095 (1980); eingegangen am 22. Mai 1980 
  Published    1980 
  Keywords    Silicon Oxide Fluorides, Noble Gas Fluorides, Uranium Fluorides, Fluorine, Halogen Fluorides 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1088.pdf 
 Identifier    ZNB-1980-35b-1088 
 Volume    35