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Fabrication and Optimization of Type II Silicon Clathrate Films
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Published on: October 14, 2025

A unique transition metal-stabilized silicon cation.

Kristine Müther1, Roland Fröhlich, Christian Mück-Lichtenfeld

  • 1Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstrasse 40, 48149 Münster, Germany.

Journal of the American Chemical Society
|July 22, 2011
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Summary

Researchers characterized a novel ferrocene-stabilized silicon cation, revealing an unusual bonding pattern. This study clarifies the interactions between ferrocene and silicon cations, important for understanding Lewis acidity.

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Area of Science:

  • Organometallic Chemistry
  • Silicon Chemistry
  • Supramolecular Chemistry

Background:

  • Trivalent silicon cations are potent Lewis acids, reacting readily with electron-donating molecules.
  • Ferrocene units can intramolecularly attenuate the Lewis acidity of silicon centers.
  • Stabilizing interactions in ferrocene-silicon cations are poorly understood due to crystallization challenges.

Purpose of the Study:

  • To structurally characterize a ferrocene-stabilized silicon cation.
  • To elucidate the bonding interactions between the ferrocene backbone and the silicon cation.
  • To understand the charge distribution and geometry of this novel species.

Main Methods:

  • Single-crystal X-ray diffraction analysis.
  • Computational analysis to understand bonding interactions.
  • Spectroscopic characterization (implied).

Main Results:

  • An unprecedented bonding motif was revealed in the ferrocene-stabilized silicon cation.
  • An extreme dip angle of the silicon atom towards the iron atom was observed.
  • Two three-center-two-electron (3c2e) bonds involving both ferrocene aromatic rings were identified.
  • The positive charge remains localized on the silicon atom, which maintains a quasi-planar configuration.

Conclusions:

  • The study reveals a unique bonding interaction in ferrocene-silicon cations, distinct from related systems.
  • The findings provide new insights into the stabilization mechanisms of silicon cations by ferrocene.
  • This work advances the understanding of organosilicon chemistry and Lewis acid stabilization.