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  • Wiley-Blackwell  (4)
  • 1985-1989  (4)
  • 1987  (4)
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  • Wiley-Blackwell  (4)
  • Wiley  (4)
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  • 1985-1989  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 547 (1987), S. 216-224 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Experimental Investigations on the Tungsten Transport in Systems Containing Fluorine CompoundsInformation on the chemical processes in tungsten incandescent lamps containing gaseous fluorides are obtained by i.r. and u.v. spectroscopic and mass spectrometric analysis of the gasphase as well as by investigating the deposits at the wall and the changes at the filament. Due to the involvement of the wall in the reaction fluorine carrier gases are converted irreversibly into SiF4 which also maintains the chemical tungsten transport. In systems containing fluorine and bromine silicon bromide fluorides are formed.
    Notes: Durch die IR- und UV-spektroskopische sowie massenspektrometrische Analyse der Gasphase sowie die Untersuchung gebildeter Beläge und der Veränderungen am Glühkörper werden Aussagen über die chemischen Vorgänge in Wolframlampen mit fluorhaltigen Füllgasen erhalten. Fluorträgergase werden in der brennenden Lampe durch die Einbeziehung der Wand in das Reaktionsgeschehen irreversibel in SiF4 umgewandelt, das selbst transportaktiv ist. In Fluor und Brom enthaltenden Systemen werden Siliciumbromidfluoride, SiBr4-xFx, gebildet.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 551 (1987), S. 223-230 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of CF4, CBrF3, and CBr2F2 with SilicaCF4 reacts with silica above 1200 K forming SiF4 and CO2. CBrF3 and CBr2F2 yield SiF4, Br2, CO2, and CO as well as products of pyrolysis, such as C2BrF5, C2Br2F4, and others. The reaction starts at 900 K (CBrF3) or 700 K (CBr2F2), resp. The CO2/CO ratio is higher than expected. SiF4 is absorbed at the surface of silica to a considerable extent.
    Notes: CF4 reagiert mit Kieselglas oberhalb 1200 K unter Bildung von SiF4 und CO2. CBrF3 und CBr2F2 ergeben SiF4, Br2, CO2 sowie CO und zwischenzeitlich als Pyrolyseprodukte unter anderen C2BrF5 und C2Br2F4. Die Reaktion beginnt bei 900 K (CBrF3) bzw. bei 700 K (CBr2F2). Das CO2/CO-Verhältnis ist höher als erwartet. SiF4 wird an der Oberfläche des Kieselglases in beträchtlichem Umfang absorbiert.
    Additional Material: 2 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 547 (1987), S. 205-215 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thermodynamic Calculations on the Transport of Tungsten in Systems Containing Fluorine CompoundsInformation on the transport behaviour of tungsten in systems containing fluorine is obtained by a thermodynamic analysis of the systems W(s)-F, W(s)-F-O, W(s)-F-Br, W(s)-F-Br-O, W(s)-Si-F, W(s)-B-F, W(s)-Si-F-Br, and W(s)-B-F-Br. The results are compared with experimental findings. The influence of bromine, oxygen, silicon, and boron on the transport of tungsten is investigated. The nonblackening condition (dλW/dT 〈 0) is fulfilled in systems containing fluorine as well as bromine.
    Notes: Durch eine thermodynamische Analyse der Systeme W(s)-F, W(s)-F-O, W(s)-F-Br, W(s)-F-Br-O, W(s)-Si-F, W(s)-B-F, W(s)-Si-F-Br und W(s)-B-F-Br werden Aussagen zum Transportverhalten von Wolfram in fluorhaltigen Systemen erhalten und mit experimentellen Befunden verglichen. Der Einfluß von Brom, Sauerstoff, Silizium und Bor auf den Wolframtransport wird untersucht. Die Nichtschwärzungsbedingung (dλW/dT 〈 0) ist in fluor- und bromhaltigen Systemen erfüllt.
    Additional Material: 5 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 544 (1987), S. 225-231 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: N.M.R. Investigations of Fluorodiazadiphosphetidines and Fluoro-λ5-monophosphazenesThe 19F and 31P n.m.r. data of 37 fluorodiazadiphosphetidines [RR′PF—NC6H4X]2, and 62 fluoro-λ5-monophosphazenes, RR′PF=NC6H4X, are submitted. In the case of tetrafluorodiazadiphosphetidines, [RPF2—NC6H4X]2, an intramolecular exchange of the fluorine atoms at phosphorus has to be concluded from the n.m.r. data. The influence of the substituents R and X on the n.m.r. parameters is discussed using simple models of molecular structure.
    Notes: Es werden die 19F- und 31P-NMR-Daten von 37 Fluorodiazadiphosphetidinen, [RR′PF—NC6H4X]2, und 62 Fluoro-λ5-monophosphazenen, RR′PF=NC6H4X, mitgeteilt. Aus ihnen muß für die Tetrafluorodiazadiphosphetidine, [RPF2—NC6H4X]2, auf einen intramolekularen Positionswechsel der Fluoratome am Phosphor geschlossen werden. Der Einfluß der Substituenten R und X auf die NMR-Parameter wird anhand einfacher Modelle der Molekülstruktur diskutiert.
    Additional Material: 1 Ill.
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