Issue 24, 2019

Bis(trimethylsilyl)amide complexes of s-block metals with bidentate ether and amine ligands

Abstract

The synthesis of the bistrimethylsilylamide complexes of alkali and alkaline-earth metals with 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 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 as mononuclear complexes i.e. 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.

Graphical abstract: Bis(trimethylsilyl)amide complexes of s-block metals with bidentate ether and amine ligands

Supplementary files

Article information

Article type
Paper
Submitted
04 Apr 2019
Accepted
10 May 2019
First published
11 May 2019

Dalton Trans., 2019,48, 8966-8975

Bis(trimethylsilyl)amide complexes of s-block metals with bidentate ether and amine ligands

P. Schüler, H. Görls, M. Westerhausen and S. Krieck, Dalton Trans., 2019, 48, 8966 DOI: 10.1039/C9DT01426H

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