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2001 (1)
1993 (1)
1Author    Norbert Kuhna, Stefan Fuchs3, Rolf Minkwitzb, Thorsten Berendsb, Herrn Professor, DrH P FritzRequires cookie*
 Title    Collidinium-und Imidazolium-Salze Fluor-haltiger Anionen  
 Abstract    Die Kristall­ struktur von [CollH]2 [AsF6][As2 Fu ] (Coli = 2,4,6-Trimethylpyridin) Collidinium and Imidazolium Salts of Fluorine-Containing Anions. The Crystal Structure of [CollH]2[AsF6][As2Fl l ] (Coll = 2,4,6-Trimethylpyridine) From s-Collidine (1, Coll) and aqueous HF compounds of the composition Coll • n HF (n = 1 -2) are formed which are transformed to [CollH]+ [HF2]~ (2) by sublimation. [CollH]2[AsF6][As2F] J (3) is obtained from 1 and the superacid system HF/AsF5. 2 reacts with 2,3-dihydro-l,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (4, Im) to give the imidazo­ lium salt [ImH]+ [HF2]~ (5). Hydrogen bonds in the crystal structure of [CollH]2[AsF6][As2Fn ] (3) are discussed. 
  Reference    Z. Naturforsch. 56b, 626—629 (2001); eingegangen am 3. Mai 2001 
  Published    2001 
  Keywords    Hydrogen Fluoride, Imidazoles, Pyridines 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0626.pdf 
 Identifier    ZNB-2001-56b-0626 
 Volume    56 
2Author    R. O. Horenian, W. WeyrichRequires cookie*
 Title    Momentum-Density Studies of Some Compounds with Triatomic Linear Anions  
 Abstract    High-purity powder samples of lithium and sodium azide (LiN 3 , NaN 3), cyanate (LiOCN, NaOCN) and hydrogen fluoride (LiFHF, NaFHF) were studied by means of 59.54 keV Compton spectroscopy. The measured isotropic Compton profiles were corrected for multiple scattering and transformed to spherically averaged reciprocal form factors B a (s). The experimental results are compared with theoretical reciprocal form factors obtained from Hartree-Fock calculations with different types of basis sets (Gaussian-and Slater-type orbitals, with and without polarisation functions) both for the free ions and for several kinds of clusters. The importance of intraionic and interionic interaction for the description of chemical bonding in these compounds is pointed out and discussed. 
  Reference    Z. Naturforsch. 48a, 325—333 (1993); received January 28 1993 
  Published    1993 
  Keywords    Compton spectroscopy, Azides, Hydrogen fluorides, Cyanates, Ionic crystals 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0325.pdf 
 Identifier    ZNA-1993-48a-0325 
 Volume    48