Diagnostics for diagostics: The silylium ion 1 (see picture; C orange, Si red, H gray) is highly fluxional at room temperature but at -80°C exhibits a symmetric structure with a three-center two-electron Si-H-Si bond supported by two additional Si←H-Si agostic interactions. In the related cation 2, two Si-H bonds coordinate equivalently to the cationic silicon center to afford a symmetrical pentacoordinate silylium ion.
- Agostic interactions
- Density functional calculations
- Silylium ions
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