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Abstract
Hexacoordinate silicon bischelates with bulky monodentate alkyl ligands tend to ionize, while those with electron-withdrawing CF 3 substituents on the chelate rings resist ionization. A hexacoordinate silicon complex withboth of these structural features was prepared and was found, by its temperature-dependent 2 9 Si NMR spectroscopy, to undergo a reversible neutral dissociation of the N-Si dative bond, which satisfies both tendencies. The results are supported by crystallographic structure analyses and by nonempirical MO calculations of isodesmic reaction energies.
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