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An asymmetrically distorted structure of the 1-methylsilacyclohexane radical cation: ESR evidence

✍ Scribed by Masaru Shiotani; Kenji Komaguchi; Joji Ohshita; Mitsuo Ishikawa; Lars Sjöqvist

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
571 KB
Volume
188
Category
Article
ISSN
0009-2614

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✦ Synopsis

Electronic and geometric structures of the I-methylsilacyclohexane ( I-Me-cSiCS) radical cation in a solid perfluoromethylcyclohexane matrix at low temperature were studied by ESR spectroscopy with the aid of three selectively deuteriated l-methylsilacyclohexanes, I-Me-cSiC5-2,2-d,, I-Me-&U-2,2,6,6-d,, and I-Me-d,-cSiCS. The radical cation was found to have an asymmetrically distorted geometrical structure with one of the Si-C bonds elongated with its electronic ground state proposed to be 2A in C, symmetry. This conclusion was derived from an analysis of the temperature-dependent ESR spectra employing a dynamic model of interconversion between two energetically equivalent distorted mirror image structures.

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