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Article

Heteroleptic triphenylacetate-tetramethylaluminate complexes of lanthanum and neodymium. Coordination of La3+ with the π-system as the reason for the low catalytic activity of lanthanum complexes

Inorganica Chimica Acta. 2019. Vol. 487. P. 153-161.
Roitershtein D., Vinogradov A. A., Lyssenko K. A., Ananyev I. V., Yakovlev V. A., Kostitsyna N. A., Nifant'ev I. E.

sized
and structurally characterized. Their reaction with THF leads to the formation of the solvent-separated ion
pairs [(Ph3CCOO)2Ln(THF)5]+[(Al(CH3)4]−. The tendency of the La3+ cation to interact with the π-electron
system of phenyl rings has been revealed by molecular structure analysis for La-Al and Nd – Al tetramethylaluminate
complexes in combination with the study of butadiene and isoprene polymerization by using
catalyst system based on these complexes and aluminum alkyl cocatalysts. Coordination of Ln3+ cation by the π-
electron conjugated system makes it difficult to form the catalytically active intermediates and decreases the
catalytic activity.