Journal
ORGANOMETALLICS
Volume 24, Issue 12, Pages 2913-2920Publisher
AMER CHEMICAL SOC
DOI: 10.1021/om0500568
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Hexacoordinate silicon bischelates with bulky monodentate alkyl ligands tend to ionize, while those with electron-withdrawing CF3 substituents on the chelate rings resist ionization. A hexacoordinate silicon complex with both of these structural features was prepared and was found, by its temperature-dependent Si-29 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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