| | 2 | Author
| H. Erbert, W. Roesky, Mathias Noltem, GeorgeM. Sheldrick | Requires 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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| default:Reihe_B/40/ZNB-1985-40b-0883.pdf | | | | Identifier
| ZNB-1985-40b-0883 | | | | Volume
| 40 | |
| 3 | Author
| H.-R Blank, M. Frank, J. Heindl, M. Kaltenhäuser, H. Köchner, W. Kreische, N. Müller, S. Porscher, T. Wagner | Requires 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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| default:Reihe_A/47/ZNA-1992-47a-0389.pdf | | | | Identifier
| ZNA-1992-47a-0389 | | | | Volume
| 47 | |
| 4 | Author
| L. G. Petersson, G. Frostell, Sweden, A. Lodding | Requires 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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| default:Reihe_C/29/ZNC-1974-29c-0417.pdf | | | | Identifier
| ZNC-1974-29c-0417 | | | | Volume
| 29 | |
| 5 | Author
| Eberhard Jacob | Requires 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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| default:Reihe_B/35/ZNB-1980-35b-1088.pdf | | | | Identifier
| ZNB-1980-35b-1088 | | | | Volume
| 35 | |
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