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'Isopolymolybdates' in keywords
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1978 (1)
1976 (1)
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1Author    Requires cookie*
 Title    Über Isopolymolybdatfeststoffe und deren Beziehung zu Isopolymolybdationen in wäßriger Lösung* Concerning Solid Isopolym olybdates an d th e ir R elation to Isopolym olybdate Ions in Aqueous Solution  
 Abstract    After a brief discussion on the output capacity of the methods used for the study of the isopolymetalates, a classification and characterization of the solid isopolymolybdates obtainable from aqueous solution is given, and the relation of the solid isopolymolybdates to the isopolymolybdate ions in solution is studied. A correlation between the occurrence or non-occurrence of a species in a solid and in its solution detectable by Raman spectro­ scopy, the solubility of the solid, and the time necessary for the formation of the solid was found. This gives important informations on the mechanisms of formation of the iso-polym etalate ions. The m ost remarkable result of this investigation is that contrary to the view of the majority of the papers on this subject the octamolybdate ion Mo80 264_ having the structure found by L i n d q v i s t does not occur in important quantities in solution at room temperature. For setting up a reaction scheme on the isopolymolybdates only very few of the confusing multiplicity of the papers give evidentiary informations. Most of the papers are overinterpreted. 
  Reference    (Z. Naturforsch. 30b, 471—484 [1975]; eingegangen am 21. Februar 1975) 
  Published    1975 
  Keywords    Isopolyanions, Isopolymolybdates, Fingerprint Raman Spectroscopy, Reaction Mechanisms 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0471.pdf 
 Identifier    ZNB-1975-30b-0471 
 Volume    30 
2Author    Karl-Heinz TytkoRequires cookie*
 Title    Über den Mechanismus der Bildung von Polyanionen in wäßriger Lösung. Zum Bildungsmechanismus eines Polytetramolybdations [Mo4014 4-]» On the Mechanism of Formation of Polyanions in Aqueous Solution. Concerning the Mechanism of Formation of a Polytetramolybdate Ion [Mo4014 4 ~]«  
 Abstract    Possible structures and the pertinent reaction pathways for the polymetalate ion present in a slightly soluble polymetalate having the analytical formula A20 • 2 MO3 have been derived on the basis of theoretical considerations. Structure and kind of combination of the tetrameric units of one of the possibilities are in agreement with the results of X-ray structure analyses. First the previously proposed planar tetrametalate ion [M40i2(0H)4] 4_ is formed by stepwise aggregation according to an addition mechanism. This species undergoes a rearrangement of the coordination sphere of two of the M atoms and is then subject to a poly condensation resulting in a polytetrametalate chain, [M40i4 4_ ]n. 
  Reference    (Z. Naturforsch. 31b, 737—748 [1976]; eingegangen am 2. Januar/16. Dezember 1975) 
  Published    1976 
  Keywords    Isopolyanions, Isopolymolybdates, Reaction Mechanisms, Polymetalate Structures 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0737.pdf 
 Identifier    ZNB-1976-31b-0737 
 Volume    31 
3Author    Tetraphenylphosphonium-Isopolymolybdates, Roger Grase, Joachim FuchsRequires cookie*
 Title    Über Tetraphenylphosphonium-Isopolymolybdate  
 Abstract    From acidified sodium molybdate solutions mixtures of two polymolybdates are precipitated by addition of tetraphenylphosphonium ions. The pure compounds obtainable by separation with selective organic solvents were identified analytically and by their vibrational spectra as octamolybdate, [P(C6Hs)4]4Mo8026, with "Lindqvist structure" and as hexamolybdate, [P(C6Hs)4Mo60i9. They are characterized by their UV-VIS spectra and X-ray powder patterns. The precipitation of the hexamolybdate from strong acidic solution can be used analytically for the determination of molybdenum. 
  Reference    Z. Naturforsch. 33b, 533—536 (1978); eingegangen am 20. Januar 1978 
  Published    1978 
  Keywords    Isopolymolybdates, Preparation, Vibrational Spectra, X-ray, UV 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0533.pdf 
 Identifier    ZNB-1978-33b-0533 
 Volume    33