Kharash Reaction on Heterogenized Metal Complexes with Bifunctional Ligands
American Journal of Physical Chemistry
Volume 2, Issue 2, April 2013, Pages: 24-32
Received: Mar. 12, 2013; Published: Apr. 2, 2013
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Authors
I. G. Tarkhanova, M. V. Lomonosov, Moscow State University, Russia, Moscow
A. I. Kokorin, N. N. Semenov Institution of the Chemical Physics, RAS, Russia, Moscow
M. G. Gantman, M. V. Lomonosov, Moscow State University, Russia, Moscow
V. M. Zelikman, M. V. Lomonosov, Moscow State University, Russia, Moscow
D. S. Tsvetkov, M. V. Lomonosov, Moscow State University, Russia, Moscow
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Abstract
New catalytic systems for polyhalogenmethanes addition to olefins were obtained by immobilization of complexes of Cu, Co, Mn, V (in the vanadyl form) and Fe with bifunctional ligands of aminoalcohols (monoethanolamine), substituted aminoalcohols (N, N-diethylaminoethanol), hydroxyaminoacids (serine, hydroxyproline) on the oxide supports. For Cu, Co, Mn, V the extrem dependence of the catalyst activity on the surface concentration of metal was observed. For iron containing systems the mechanism of the process depends on the concentration of metal — at low concentration (<0.4 wt. %) amine complex are active sites, at high concentration (>1.3 wt. %) — Lewis acid centres. By means of ESR the structure of active sites of the anchored complexes at different metal concentration was stated on the example of copper containing systems. Complexes isolated on the surface of mineral support at the expanse of strong covalent bonding of one of the lignd groups with surface hydroxyls were the most active. Such a structure provides the formation of the surface complexes of divalent copper with four nitrogen atoms in the coordination sphere.
Keywords
Transition Metal Complexes, Addition, Carbon Tetrachloride, Surface, Immobilization
To cite this article
I. G. Tarkhanova, A. I. Kokorin, M. G. Gantman, V. M. Zelikman, D. S. Tsvetkov, Kharash Reaction on Heterogenized Metal Complexes with Bifunctional Ligands, American Journal of Physical Chemistry. Vol. 2, No. 2, 2013, pp. 24-32. doi: 10.11648/j.ajpc.20130202.11
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