Effect of Light Exposure on UV-Vis Spectrum of [(nBuCp)2ZrCl2] Based Catalyst

UV‐vis spectroscopic study revealed that vinylcyclohexane interaction with zirconocene catalyst is enhanced on light exposure. If oxygen is present it interacts with the catalyst, hindering vinylcyclohexane interaction and consequently lowering the catalyst activity. The catalyst activity can be rec...

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Bibliographic Details
Published in:Macromolecular chemistry and physics 2003-05, Vol.204 (8), p.1085-1089
Main Authors: Mäkelä-Vaarne, Nora I., Kallio, Kalle, Reichert, Karl-Heinz, Leskelä, Markku A.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
metallocene catalysts
Organic polymers
Physicochemistry of polymers
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
UV-vis spectroscopy
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Summary:UV‐vis spectroscopic study revealed that vinylcyclohexane interaction with zirconocene catalyst is enhanced on light exposure. If oxygen is present it interacts with the catalyst, hindering vinylcyclohexane interaction and consequently lowering the catalyst activity. The catalyst activity can be recovered with light exposure if low O2 concentrations are used since in light the zirconocene‐vinylcyclohexane interaction is favoured over the zirconocene‐O2 interaction. Moreover, 1H NMR studies of the reaction products showed that the structures of the vinylcyclohexane‐based species produced with light irradiation were identical to the species produced in dark. This indicates that light exposure of the catalytic system does not change the reaction mechanism. Absorption spectrum of [(nBuCp)2ZrCl2]/MAO/VCH. (a) reaction in dark, (b) reaction with irradiation, (c) reaction with O2 treatment in dark and (d) reaction with O2 treatment with irradiation.
ISSN:1022-1352
1521-3935
DOI:10.1002/macp.200390075