1. Synthesis and structural characterisation of mixed alkali metal–magnesium mixed ligand alkyl-amido ate complexes
- Author
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Andrikopoulos, Prokopis C., Armstrong, David R., Kennedy, Alan R., Mulvey, Robert E., O’Hara, Charles T., Rowlings, René B., and Weatherstone, Susan
- Subjects
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ALKALI metals , *MAGNESIUM , *AMIDES , *X-ray crystallography - Abstract
Abstract: Using two different reaction methodologies, two alkali metal–magnesium alkyl bis(amide) complexes were synthesised. First the lithium magnesiate LiMg{μ-N(SiMe3)2}2( t Bu) (1) was prepared by combining equimolar quantities of t BuLi and Mg{N(SiMe3)2}2 in hydrocarbon solvent. An X-ray crystallographic study revealed that the asymmetric unit of 1 has a dinuclear arrangement, based on a planar Li–N–Mg–N four-membered ring. As a result of the presence of intermolecular agostic interactions between the Li centre of one asymmetric unit and a methyl group which is resident on the terminal tert-butyl group of another, 1 is polymeric in the solid-state. Second the sodium magnesiate NaMg{μ-N(SiMe3)2}2( t Bu)·(OEt2) (2) was prepared by reacting two molar equivalents of Na{N(SiMe3)2} with one molar equivalent of t BuMgCl in hydrocarbon/diethyl ether solution. X-ray crystallographic analysis revealed that the asymmetric unit of 2 consisted of a dinuclear molecular arrangement. As expected it is not polymeric due to the coordination of the Lewis basic ether. Stabilizing intramolecular agostic Na⋯C bonds are observed (where C is a methyl group resident on a Si atom). [Copyright &y& Elsevier]
- Published
- 2007
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