Seven-coordinated tantalum trichloride complex containing substituted pyrrolyl ligand: Synthesis and characterization of [NC4H3(CH2NMe2)-2]2 TaCl3
Resource
Inorganica Chimica Acta 342: 59-63
Journal
Inorganica Chimica Acta
Journal Volume
342
Pages
59-63
Date Issued
2003
Author(s)
Abstract
bis[2-(Dimethylaminomethyl)pyrrolyl]tantalum chloride (1) was prepared by treatment of the TaCl5 with 2 equiv. of [2-(dimethylaminomethyl)pyrrolyl]lithium. The solid state structure of 1 shows the seven-coordinated tantalum atom, with a geometry corresponding to a pentagonal bipyramidal structure, in which two chlorine atoms occupy the axial position with the angle of 174.8(2)°. Furthermore, variable-temperature 1H NMR spectra infer the fluxionality of the two chelating pyrrolyl ligands with an estimated energy barrier of 13.8 kcal mol-1. Compound 1 shows no catalytic activity toward ethylene polymerization even activated with MAO. © 2002 Elsevier Science B.V. All rights reserved.
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journal article
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