Highly Hindered Amido-Lithium and -Magnesium Complexes: Crystal Structures of [Li (µ-N(SiMe3)2) (thf)]2 and [MgBus (µ-N(SiMe3)2)]2(thf = Tetrahydrofuran)

Lutz M. Engelhardt, Brian S. Jolly, Peter C. Junk, Colin L. Raston, Brian W. Skelton, Allan H. White

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Abstract

Treatment of hexamethyldisilazane in thf (tetrahydrofuran) with LiBu in hexane yields [Li(µ- N(SiMe3)2)(thf)]2, (1). MgBusBu in heptane with hexamethyldisilazane results in initially formation of [MgBus(µ-N(SiMe3)2)]2, (2), then ‘Mg(N(SiMe3)2)2’, (3). The structures of (1) and (2) have been determined by X-ray diffraction. Remarkably, they are isomorphous: crystals are tetragonal, space group P4n2 with a 9•970(7), c 16•753(9) Å for (1), and a 9•524(6), c 17•385(9) A for (2), with Z = 2. The lattices are comprised of discrete molecules with symmetry 222, and thus Busdisorder in (2), with the amido ligands bridging three-coordinate metal centres [Li-N 2•025(9), Li-O 1•882(14) Å, Li-N-Li 73•7(5)°, N-Li-N 106•3(6)°, O-Li-N 126•8(3)° (1); Mg-N 2•118(4), Mg-C 2•08(1) Å, Mg-N-Mg 87•1(2)°, N-Mg-N 92•9(2)° C-Mg-N 133•6(1)° (2)].

Original languageEnglish
Pages (from-to)1337-1345
Number of pages9
JournalAustralian Journal of Chemistry
Volume39
Issue number9
DOIs
Publication statusPublished - 1986
Externally publishedYes

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