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Zhou S, Wu S, Zhu H, et al. Synthesis, structure and catalytic activity of alkali metal-free bent-sandwiched lanthanide amido complexes with calix[4]-pyrrolyl ligands. Dalton Trans. 2011;40(37):9447-53doi: 10.1039/c1dt10622h.
Zhou, S., Wu, S., Zhu, H., Wang, S., Zhu, X., Zhang, L., Yang, G., Cui, D., & Wang, H. (2011). Synthesis, structure and catalytic activity of alkali metal-free bent-sandwiched lanthanide amido complexes with calix[4]-pyrrolyl ligands. Dalton transactions (Cambridge, England : 2003), 40(37), 9447-53. https://doi.org/10.1039/c1dt10622h
Zhou, Shuangliu, et al. "Synthesis, structure and catalytic activity of alkali metal-free bent-sandwiched lanthanide amido complexes with calix[4]-pyrrolyl ligands." Dalton transactions (Cambridge, England : 2003) vol. 40,37 (2011): 9447-53. doi: https://doi.org/10.1039/c1dt10622h
Zhou S, Wu S, Zhu H, Wang S, Zhu X, Zhang L, Yang G, Cui D, Wang H. Synthesis, structure and catalytic activity of alkali metal-free bent-sandwiched lanthanide amido complexes with calix[4]-pyrrolyl ligands. Dalton Trans. 2011 Oct 07;40(37):9447-53. doi: 10.1039/c1dt10622h. Epub 2011 Aug 17. PMID: 21850293.
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Dalton Trans. 2011 Oct 07;40(37):9447-53. doi: 10.1039/c1dt10622h. Epub 2011 Aug 17.

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

Dalton transactions (Cambridge, England : 2003)

Shuangliu Zhou, Shihong Wu, Hong Zhu, Shaowu Wang, Xiancui Zhu, Lijun Zhang, Gaosheng Yang, Daohui Cui, Hengyu Wang

Affiliations

  1. Anhui Laboratory of Molecule-Based Materials, School of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, P. R. China.

PMID: 21850293 DOI: 10.1039/c1dt10622h

Abstract

Simple silylamine elimination reactions of calix[4]-pyrrole [R(2)C(C(4)H(2)NH)](4) (R = Me (1), {-(CH(2))(5)-}(0.5) (2)) with 2 equiv. of [(Me(3)Si)(2)N](3)Ln(μ-Cl)Li(THF)(3) (Ln = Nd, Sm, Dy) in reflux toluene, afforded the novel dinuclear alkali metal-free trivalent lanthanide amido complexes (η(5):η(1):η(5):η(1)-R(8)-calix[4]-pyrrolyl){LnN(SiMe(3))(2)}(2) (R = Me, Ln = Nd (3), Sm (4), Dy (5); R = {-(CH(2))(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 η(5) fashion and along with three nitrogen atoms from N(SiMe(3))(2) and two other pyrroyl rings in η(1) 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.

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