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  • Electronic Resource  (3)
  • 1970-1974  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 38 (1973), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 27 (1972), S. 339-354 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Elektronenstruktur von Äthylen, das an ein aktives Zentrum eines Titan- bzw. Nickelfluoridkristalls gebunden ist, ist mittels der Hartree-Fock-Slater-Theorie kombiniert mit der sog. Discrete Variational Method theoretisch behandelt worden. Es zeigt sich, daß dieπ-Backdonation sowohl im Nickel- als auch im Titankomplex außerordentlich wichtig ist; sie entsteht durch eine starke Wechselwirkung eines Metall-d-Orbitals sowohl mit einemσ * als auch einemπ *-Orbital des Äthylens. Dies führt zu einer erheblichen Schwächung der Doppelbindung. Außerdem werden die beiden Systeme (Titan und Nickel) miteinander verglichen.
    Notes: Abstract In order to be able to describe the ethylene molecule bonded to an active site of a Titanium- or Nickel fluoride crystal, we have used the Hartree-Fock-Slater model, implemented by a Discrete Variational Method, as introduced by Ellis and Painter. The study of the ethylene molecule at a crystal surface then gives a clear, easily interpreted picture of the electronic structure. Theπ-back donation from metal to olefin is found to be extremely important, both in the Ti- and in the Ni-complex. This back donation is caused by a strong interaction of ad orbital of the central ion with aσ * as well as theπ * molecular orbital of ethylene. As a result of these interactions, the C-C bond of ethylene is weakened considerably. A comparison is made between the Ti-ethylene and the Ni-ethylene systems.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 34 (1974), S. 49-59 
    ISSN: 1432-2234
    Keywords: Tetraoxo complexes ; Group VIII oxides and oxyanions ; Hartree-Fock-Slater discrete variational method (HFS-DVM)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The electronic structures of FeO 4 2− , RuO4, RuO 4 − , RuO 4 2− and OsO4 have been investigated using the Hartree-Fock-Slater Discrete Variational Method. The calculated ordering of the valence orbitals is 2t 2, 1e, 2a 1, 3t 2 andt 1 with thet 1 orbital as the highest occupied. The first five charge transfer bands are assigned as:t 1→2e(v 1), 3t 2→2e(v 2),t 1→4t 2(v 3), 3t 2→4t 2(v 4) and 2a 1→4t 2(v 5). It is suggested that ad-d transition should be observed at 1.5 eV in RuO 4 − and RuO 4 2− .
    Type of Medium: Electronic Resource
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