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UV/VIS‐spektroskopischer Nachweis einer selektiven Komplexbildung zwischen WOCl 4 und trimethylaluminium. Ein weg zur Charakterisierung von methylaluminoxanen
Author(s) -
ThornCsányi Emma,
Dehmel Jörg,
Halle Olaf,
Sciborski Winfried
Publication year - 1994
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1994.021950901
Subject(s) - chemistry , polymer chemistry , reaction rate constant , alkylation , complex formation , photochemistry , kinetics , inorganic chemistry , organic chemistry , catalysis , physics , quantum mechanics
The kinetic analysis of the reaction between WOCl 4 and trimethylaluminium (TMA) shows that TMA forms a 2 : 1 mol/mol‐complex with WOCl 4 before it acts as an alkylating agent. The reaction steps can be observed separately because rate constants k complex formation ≫ k alkylation and ultraviolet/visible (UV/VIS) absorption coefficients ϵ complex ≠ ϵ WOCl 4 . The rapid change of the WOCl 4 ‐UV/VIS‐spectrum is typical for TMA and cannot be observed with methylaluminoxane (MAO) or with dimethylaluminium chloride. Due to the selective complex formation it is possible to determine the exact content of “free” TMA in MAO.