Fleming, Ben J. and Garcia-Alvarez, Pablo and Keating, Elizabeth and Kennedy, Alan and O'Hara, Charles (2012) Synthesis and structural elucidation of a rare example of a tris(amido) potassium magnesiate. Inorganica Chimica Acta, 384. pp. 154-157. ISSN 0020-1693Full text not available in this repository. (Request a copy from the Strathclyde author)
An equimolar quantity of benzylpotassium and di-n-butylmagnesium were combined with three molar equivalents of diphenylamine in a solvent medium which consisted on THF, hexane and N,N,N',N',N ''-pentamethyldiethylenetriamine (PMDETA). This mixture produces a rare example of a potassium tris(amido) magnesiate, namely (PMDETA)center dot K(mu-NPh2)Mg(THF)(NPh2)(2) 1. Complex 1 was characterized by X-ray crystallography and H-1 and C-13 NMR spectroscopy. The solid state structure of 1 (particularly the metals' co-ordination spheres) differs considerably from that of previously characterized potassium magnesiates, presumably due to the less sterically demanding nature of the amido ligand employed in this study. The magnesium center is four-coordinate (usually three-coordinate in such ate systems) and as well as binding to three amido ligands, is coordinated to a THF molecule. Turning to the potassium center, it is bound to three N centers from the triamine PMDETA, only one amido group, and its coordination sphere is completed by a series of aryl-pi contacts. The H-1 NMR solution studies in C6D6 appear to show that the complex does not stay intact in arene but likely forms a solvent-separated species such as [K(C6D6)(x)](+)[(THF) Mg(NPh2)(3)].
|Keywords:||structural elucidation , tris(amido) potassium magnesiate , spectroscopy, Physical and theoretical chemistry, Materials Chemistry, Physical and Theoretical Chemistry, Inorganic Chemistry|
|Subjects:||Science > Chemistry > Physical and theoretical chemistry|
|Department:||Faculty of Science > Pure and Applied Chemistry|
|Depositing user:||Pure Administrator|
|Date Deposited:||08 Jun 2012 13:29|
|Last modified:||07 Jan 2017 01:11|