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1988 (1)
1987 (1)
1Author    F. Seel, J. SchuhRequires cookie*
 Title    Über die Umsetzung von Kupfersulfat mit Carbonsäuren und Carbonsäurederivaten in wäßrigen Lösungen unter hydrothermalen Bedingungen The Reaction of Copper Sulfate with Carboxylic Acids and their Derivatives in Aqueous Solutions under Hydrothermal Conditions  
 Abstract    Under hydrothermal conditions aqueous solutions of copper(II) sulfate (1) are reduced by means of saturated fatty acids with hydrogen at the a-atom to yield crystalline copper. In all cases carbon dioxide is liberated and lower fatty acids and ketones can be identified as reaction prod-ucts. a-Hydroxy and a-aminocarboxylic acids proved to be very effective reducing agents towards 1. The yield of copper varied from 2 to 2.5 mol Cu per 1 mol of amino acid. The reaction of 1 is suppressed by sulfuric acid. The presence of hydrochlorid acid or chlorides leads to the precipita-tion of copper(I) chloride. The mechanisms of the decomposition of the various types of carboxy-lic acids is discussed. It was also possible to precipitate metallic copper by means of various proteins. 
  Reference    Z. Naturforsch. 42b, 157—162 (1987); eingegangen am 19. September 1986 
  Published    1987 
  Keywords    Copper, Copper(II) Sulfate, Carboxylic Acids, Hydrothermal Reactions 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0157.pdf 
 Identifier    ZNB-1987-42b-0157 
 Volume    42 
2Author    Klaus-Jürgen Range, Reinhard Zintl, AntonM. HeynsRequires cookie*
 Title    The Thermal Decomposition of Ammonium Metavanadate(V) in Open and Closed Systems  
 Abstract    The thermal decomposition of ammonium metavanadate(V) has been studied at atmospheric pressure, at hydrothermal, and high-pressure conditions, respectively. In a closed high-pressure system a redox reaction between vanadium(V) and ammonia takes place, to yield with increasing temperature the compounds (NH 4) 2 V 6 0 12 (0H) 2 , VO : _ A (OH) A , and V 2 "0 2 "_,, the composition of the product eventually approaching V 2 0 3 at 1100 °C. All these compounds can easily be con-verted into V 2 O s by heating in air. The mid-infrared spectra of the decomposition products obtained by slow heating of NH 4 VO, in air, are virtually identical and show that ammonium hexavanadate(V), (NH 4) 2 V h O| 6 , is the most important, and perhaps only, intermediate in the "non-reduction" case. On further heating, (NH 4) 2 V 6 0 lft may not only loose ammonia and water to form V 2 0 5 but could as well partially be reduced by ammonia. This could explain the diversity of intermediate "compounds" described in the literature. Hydrothermal reaction of NH 4 VO, yielded (NH 4) 05 V 2 O 5 , (NH 4) 2 V,0 8 , and V 2 0 3 at rather low temperatures. 
  Reference    Z. Naturforsch. 43b, 309—317 (1988); received November 9 1987 
  Published    1988 
  Keywords    Ammonium Metavanadate(V), Thermal Decomposition, High-pressure Reactions, Hydrothermal Reactions 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0309.pdf 
 Identifier    ZNB-1988-43b-0309 
 Volume    43