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1979 (1)
1Author    Joachim Fuchs, Ernst-Peter FlindtRequires cookie*
 Title    Darstellung und Strukturuntersuchung von Polywolframaten Ein Beitrag zur Aufklärung des Parawolframations A A Contribution to the Paratungstate A Problem  
 Abstract    Polytungstates are obtained by the reaction of hydrated tungsten (VI) oxide with bases or salts after occasional addition of organic solvents. With liquid ammonia the as yet unknown ditungstate, (NH4)2W2Ü7, is produced. Its IR spectrum has few absorption bands suggesting a very simple constitution. Piperidine yields 5 compounds according to varied experimental conditions, which all exhibit approximately paratungstate composi-tions but different crystal habits, lattice parameters, solubility and IR spectra. Structure determinations indicate that two of these compounds are heptatungstates, the anion of which, W7024 6-, has the same structure as the heptamolybdate ion, Mo7024 6 ~. From a comparison of their Raman spectra with the spectrum of a freshly acidified sodium tungstate solution (designated as Paratungstate A) it may be concluded that the heptatungstate ion is the predominant species in such a solution. The anion structure of the previously described tributylammonium(5:24):tungstate [(GiHg^NHJsHaW^C^o was elucidated by X-ray methods. Here the tungsten atoms show the same arrangement as in the a-dodecatungstatophosphate ion (Keggin structure). 
  Reference    Z. Naturforsch. 34b, 412—422 (1979); eingegangen am 28. November 1978 
  Published    1979 
  Keywords    Properties, X-ray, Heptatungstate, Paratungstate A, Metatungstate 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0412.pdf 
 Identifier    ZNB-1979-34b-0412 
 Volume    34