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Bis(trimethylsilyl)amide Complexes of the s-Block Metals with Bidentate Ether and Amine Ligands

Abstract

The synthesis of the bistrimethylsilylamide complexes of the alkali and alkaline-earth metals with the bidentate ether and amine bases 1,2-bis(dimethylamino)ethane (tetramethylethylenediamine, tmeda), dimethyl-methoxyethylamine (dmmea), and 1,2-dimethoxyethane (dme) succeeds via addition of these bases to the coligand-free complexes or via ligand exchange of thf adducts. The lithium and sodium complexes are mononuclear (exceptions: [(dme)LiN(SiMe3)2]2 and [(tmeda)NaN(SiMe3)2]2) whereas the heavier congeners form dinuclear compounds with central four-membered M2N2 rings. The alkaline-earth metal complexes crystallize mononuclear as [(L)M{N(SiMe3)2}2] with four-coordinate metal centers or as [(L)2M{N(SiMe3)2}2] with six-coordinate metal atoms. Intramolecular steric repulsion leads to distortions such as an asymmetric coordination of L and/or significantly different proximal and distal M-N-Si bond angles.

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Publication details

The article was received on 04 Apr 2019, accepted on 10 May 2019 and first published on 11 May 2019


Article type: Paper
DOI: 10.1039/C9DT01426H
Dalton Trans., 2019, Accepted Manuscript

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    Bis(trimethylsilyl)amide Complexes of the s-Block Metals with Bidentate Ether and Amine Ligands

    P. Schüler, H. Görls, M. Westerhausen and S. Krieck, Dalton Trans., 2019, Accepted Manuscript , DOI: 10.1039/C9DT01426H

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