Abstract
The crystal and molecular structures of two dimesylamine derivatives, RN(SO2CH3)2, (R = Si(CH3)3 (1a), R-CH3 (1b)) were determined. Com pound 1a displays a very long Si-N bond which is well outside the range normally found in comparable com pounds (185.1 pm, mean value for two crystallographically independent m olecules). The unusually large bond length can be explained by the absence of (d -p)π interactions between silicon and nitrogen. In both com pounds the bonding geometry around the nitrogen atoms is essentially planar

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