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'Thermal Decomposition' in keywords Facet   Publication Year 1999  [X]
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1Author    H. Oppermann, H. Dao Quoc, A. Morgenstern, Prof ManfredRequires cookie*
 Title    Thermisches Verhalten von festem LaAlCl6 und chemischer Transport von LaCl3 mit AICI3 Thermical Behaviour of Solid LaAlCl6 and Chemical Transport of LaCl3 with A1C13  
 Abstract    The thermodynamical data of solid aluminium lanthanum chloride LaAlCl6 have been ob­ tained by determination of the decomposition equilibria from total pressure measurements. The melting diagram was determined by DTA. The chemical transport of LaCl3 with A1C13 is suggesting the existence of the gaseous complex LaAl3C l12. The data are: Z\H(LaAlCl6 f 298) =-427,1 ±2,5 kcal/mol, S°(LaAlCl6.f.298) = 61 ±2,5 cal/K-mol, _AH(LaAl3C l12 g 298) =-712 ± 7 kcal/mol, S°(LaAl3C l12>g,298) = 205 ± 3 cal/K-mol. 
  Reference    Z. Naturforsch. 54b, 1410—1416 (1999); eingegangen am 15. Juli 1999 
  Published    1999 
  Keywords    Aluminium Lanthanum Chloride, Thermal Decomposition, Chemical Transport, Enthalpy, Entropy 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1410.pdf 
 Identifier    ZNB-1999-54b-1410 
 Volume    54 
2Author    C. Hennig, H. OppermannRequires cookie*
 Title    Thermische Zersetzung und Lösungskalorimetrie von Ammoniumneodymbromiden Thermal Decomposition and Solution Calorimetry of Ammonium Neodymium Bromides  
 Abstract    The thermal decomposition equilibria of ammonium neodymium bromides (NH4)3NdBr6, (NH4)2NdBr5 and NH4Nd2Br7 have been investigated by total pressure measurements. The thermodynamical data of these solid phase complexes have been derived from the decomposition functions. The standard enthalpies of solution in 4N HBr (aq.) of (NH4)3NdBr6, (NH4)2NdBr5, NH4Nd2Br7, NdBr3 and Nd20 3 were measured. On the basis of these values and tabulated data, the standard enthalpies at 298 K of the ammonium neodymium bromides were derived and compared with the results obtained from the total pressure measurements. Data by total pressure measurement: /\Hß((NH4)3NdBr6 f i98) = -399,1 ± 4,9 kcal/mol; S°((NH4)3NdBr6f298) = 153,4 ± 7,4 cal/K-mol; Z\H£((NH4)2NdBr5 f 298) = -343,0 ± 4,4 kcal/mol; S°((NH4),NdBr5 f ,98) = 109,9 ± 6 , 8 cal/K-mol; ^H ß(N H 4N d,Br7 f 298) = -484,0 ± 5,1 kcal/mol; S°(NH4Nd2Br7 ff<298) = 127,9 ± 6 , 6 cal/K-mol. Data by solution calorimetry: zAHß(NdBr3 , -> 98) = -208,7 ± 1,6 kcal/mol; ^\Hß((NH4)3-NdBr6 f 298) = -404,8 ± 2,7 kcal/mol; _\H^((NH4),NdBr5 f ,98) = -344,2 ± 2,4 kcal/mol; JkHß(NH4Nd2Br7 f 298) = -482,7 ± 3,7 kcal/mol. 
  Reference    Z. Naturforsch. 54b, 1283—1294 (1999); eingegangen am 22. Juli 1999 
  Published    1999 
  Keywords    Ammonium Neodymium Bromides, Neodymium Bromide, Thermal Decomposition, Standard Enthalpy of Formation, Standard Entropy 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1283.pdf 
 Identifier    ZNB-1999-54b-1283 
 Volume    54 
3Author    H.-J Frohn3, H. Franke3, V. V. BardinbRequires cookie*
 Title    A Simple and Convenient Route to Arylxenon(II) Tetrafluoroborates  
 Abstract    An improved synthesis of arylxenon(II) salts is reported. The series of fluoro-containing arylxenon(II) tetrafluoroborates (aryl = C6F5, 2,3,4,5-C6HF4, 3,4,5-C6H2F3 and 3,5-CöH3F2) are prepared by the reaction of xenon difluoride with the corresponding aryldifluoroboranes. The salts [CöFsXe] [BF4] and [2,3,4,5-C6HF4Xe] [BF4] are long-term stable in anhydrous HF (aHF) solution at rt, while [3,4,5-C6H2F3Xe] [BF4] and [3 ,5-C6H3F2Xe] [BF4] are converted into 1,2,3,5-tetrafluorobenzene and 1,3,5-trifluorobenzene, respectively, within a few hours. 
  Reference    Z. Naturforsch. 54b, 1495—1498 (1999); received October 4 1999 
  Published    1999 
  Keywords    Xenon Difluoride, Fluorinated Aryldifluoroboranes, Fluorinated Arylxenon(II) Salts, Fluorine-Aryl Substitution, Thermal Decomposition 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1495.pdf 
 Identifier    ZNB-1999-54b-1495 
 Volume    54