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1979 (1)
1Author    Axel Thiele, Joachim FuchsRequires cookie*
 Title    Struktur und Schwingungsspektren von Monomolybdaten und Monowolframaten organischer Kationen Structure and Vibrational Spectra of Monomolybdates and Monotungstates with Organic Cations  
 Abstract    The crystal structures of dicyclohexylammonium-monomolybdate dihydrate [(C6Hh)2NH2]2MO04 • 2 H2O, (I), cyclohexylammonium-monomolybdate, (C6HHNH3)2MO04, (II) and terf-butylammonium-monotungstate, (C4HgNH3)2W04, (III), were elucidated. In I the anion has nearly tetrahedral structure, in II one Mo-0 distance is significantly shorter than the other three, and in III all four W-0 distances are different. In spite of the variety of structures the following basic principles are recognizable: 1) Each hydrogen atom of the cationic amino groups as well as of the water of crystallization forms hydrogen bridges. 2) Never are oxygen atoms of the same M0O4 connected by these bridges, but always oxygen atoms of neighbouring M0O4 units. 3) From an oxygen atom emanate either two or no hydrogen bridge. For the investigated molybdates (tungstates) there are in all instances isomorphous tungstates (molybdates). The number and position of the vibrational bands is in good agreement with the observed anion symmetry Td, C3V and Ci, respectively. 
  Reference    Z. Naturforsch. 34b, 145—154 (1979); eingegangen am 23. Oktober 1978 
  Published    1979 
  Keywords    Monomolybdates, Monotungstates, Organic Cations, Properties, X-ray, Vibrational Spectra 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0145.pdf 
 Identifier    ZNB-1979-34b-0145 
 Volume    34