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1993 (1)
1984 (1)
1Author    ElenaL. Belokoneva, VladimirG. Tsirel 'sonRequires cookie*
 Title    Electron Density and Bonding in Ring Silicates: Beryl, Cordierite, Dioptase  
 Abstract    The electron density and bonding in the silicates beryl, cordierite and dioptase has been investi-gated. The replacement of Be, Si and Al atoms in the identical structural fragments leads to a (^-redistribution and changes the cr-bond character from slightly polar to strongly polar. The condensation of [SiOJ-tetrahedra in the rings leads to the accumulation of electron density near bridge oxygens. This phenomenon is expressed especially in dioptase (pure ring silicate). Therefore, the electron density picture may be considered as a supplementary independent criterion for classi-fication of crystal structures. The experimental (5@-maps for H 2 0 molecules in dioptase are in good agreement with theoretical ones. The ^^-distribution of 3 d-electrons and bonding in the Jahn-Teller distorted Cu-octahedron can be interpreted from crystal-field-theory point of view. 
  Reference    Z. Naturforsch. 48a, 41—46 (1993); received January 10 1992 
  Published    1993 
  Keywords    Electron density, Bonding, Ring silicates 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0041.pdf 
 Identifier    ZNA-1993-48a-0041 
 Volume    48 
2Author    Josef KnechtRequires cookie*
 Title    ESCA-Untersuchungen über die Ladungsverteilung und den Bindungszustand der A3-und i 3-Phosphorine ESCA-Studies of the Charge Distribution and Bonding of A3-and A^-Phosphorines  
 Abstract    The ESC A -spectroscopic exam ination of Ä3-and A:'-phosphorines supports the theory, that these compounds are to be described as arom atic com pounds and as cyclic phosphonium-ylides, respectively. C ontrary to simple electronegativity considerations, the phosphorus atom in the Ä3-phosphorines is nearly neutral and not positively charged. 
  Reference    Z. Naturforsch. 39b, 795 (1984); eingegangen am 16. Jan u ar 1984 
  Published    1984 
  Keywords    E S C A Studies, Charge D istribution, Bonding, A3-and Ä3-Phosphorines 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0795.pdf 
 Identifier    ZNB-1984-39b-0795 
 Volume    39