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Equilibrium between Tetra-, Penta-, and Hexacoordinate Imine and Enamine Chelates of Silicon:  Crystal Structure and Variable-Temperature NMR

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journal contribution
posted on 14.03.2005, 00:00 by Jörg Wagler, Uwe Böhme, Erica Brendler, Gerhard Roewer
The Si-coordination sphere in the novel pentacoordinate silicon bischelate η2(N,O)-N-methyl-o-oxyacetophenoneiminato-N‘-methyl-N‘-1-(2-oxyphenyl)vinylaminatophenylsilicon, 2, which was analyzed by variable-temperature 29Si NMR spectroscopy and X-ray crystallography, was found to be temperature dependent. The addition of a third equivalent of the chelating ligand yields the hexacoordinate silicon complex bis-[η2(N,O)-(N-methyl-o-oxyacetophenoneiminato)]-η1(O)-(N-methyl-o-oxyacetophenoneiminato)phenylsilicon, 3, which undergoes Si−O bond cleavage as well as Si−N bond formation in solution.