Jump to main content
Jump to site search

Issue 37, 2011
Previous Article Next Article

Synthesis, structure and catalytic activity of alkali metal-free bent-sandwiched lanthanide amido complexes with calix[4]-pyrrolyl ligands

Author affiliations

Abstract

Simple silylamine elimination reactions of calix[4]-pyrrole [R2C(C4H2NH)]4 (R = Me (1), {–(CH2)5–}0.5 (2)) with 2 equiv. of [(Me3Si)2N]3Ln(μ-Cl)Li(THF)3 (Ln = Nd, Sm, Dy) in reflux toluene, afforded the novel dinuclear alkali metal-free trivalent lanthanide amido complexes (η5151-R8–calix[4]-pyrrolyl){LnN(SiMe3)2}2 (R = Me, Ln = Nd (3), Sm (4), Dy (5); R = {–(CH2)5–}0.5, Ln = Nd (6), Sm(7)). The complexes were fully characterized by elemental analyses, spectroscopic analyses and single-crystal X-ray analyses. X-ray diffraction studies showed that each lanthanide metal was supported by bispyrrolyl anions in an η5 fashion and along with three nitrogen atoms from N(SiMe3)2 and two other pyrroyl rings in η1 modes formed the novel bent-sandwiched lanthanide amido bridged trivalent lanthanide amido complexes, similar to ansa-cyclopentadienyl ligand-supported lanthanide amides with respect to each metal center. The catalytic activities of these organolanthanide complexes as single component L-lactide polymerization catalysts were studied.

Graphical abstract: Synthesis, structure and catalytic activity of alkali metal-free bent-sandwiched lanthanide amido complexes with calix[4]-pyrrolyl ligands

Back to tab navigation

Supplementary files

Publication details

The article was received on 11 Apr 2011, accepted on 08 Jun 2011 and first published on 17 Aug 2011


Article type: Paper
DOI: 10.1039/C1DT10622H
Dalton Trans., 2011,40, 9447-9453

  •   Request permissions

    Synthesis, structure and catalytic activity of alkali metal-free bent-sandwiched lanthanide amido complexes with calix[4]-pyrrolyl ligands

    S. Zhou, S. Wu, H. Zhu, S. Wang, X. Zhu, L. Zhang, G. Yang, D. Cui and H. Wang, Dalton Trans., 2011, 40, 9447
    DOI: 10.1039/C1DT10622H

Search articles by author

Spotlight

Advertisements