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Stable unsaturated silicon clusters (siliconoids).

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Stable silicon clusters, termed siliconoids, are crucial in silicon deposition. Recent advancements have enabled their synthesis and functionalization, offering new insights into silicon chemistry.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Unsaturated silicon clusters, or siliconoids, are vital intermediates in gas-phase silicon deposition.
  • Stable homonuclear silicon clusters were recently synthesized, unlike heavier Group 14 congeners.
  • The term "siliconoids" describes silicon-rich clusters with hemispheroidally coordinated vertices.

Purpose of the Study:

  • To review developments in stable unsaturated silicon clusters since 2005.
  • To discuss the synthesis, structure, and reactivity of functionalized siliconoids.
  • To contextualize siliconoids within soluble Zintl anions and metalloid clusters.

Main Methods:

  • Literature review of siliconoid research since 2005.
  • Analysis of synthesis strategies for stable silicon clusters.
  • Structural characterization and reactivity studies of siliconoids.

Main Results:

  • Significant progress in synthesizing and functionalizing stable siliconoids.
  • Detailed understanding of siliconoid structures and reactivity patterns.
  • Introduction of a quantitative parameter for "hemispheroidality".

Conclusions:

  • Stable siliconoids are accessible and offer versatile chemistry.
  • Functionalization of unsaturated vertices allows tailored properties.
  • Siliconoids represent a key area in silicon chemistry and materials science.