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The crystal and molecular structures of two dimesylamine derivatives, RN(SO 2 CH 3 ) 2 , (R = Si(CH 3 ) 3  (1a), R-CH 3  (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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Polysulfonylamine, VIII [1] Ein Molekül mit einer extrem langen Silicium-Stickstoff-Bindung. Festkörperstrukturen von N-Trimethylsilyl- und N-Methyl-dimesylamin / Polysulfonylamines, VIII [1] A Molecule with an Extremely Long Silicon-Nitrogen Bond. Solid State Structures of N-Trimethylsilyl- and N-Methyl-dimesylamine