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Issue 21, 2018
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Stable unsaturated silicon clusters (siliconoids)

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Unsaturated silicon clusters are key intermediates of silicon deposition processes from the gas phase, which is reflected in the recently introduced term “siliconoids” for silicon rich clusters with at least one hemispheroidally coordinated vertex. Unlike the case of metalloid clusters of heavier Group 14 elements, stable homonuclear derivatives containing silicon have become available just recently. This review summarizes the developments since the first report on a stable unsaturated silicon cluster in 2005. The synthesis, structure and reactivity under retention of the unsaturated vertices (i.e. the functionalization) of stable siliconoids is discussed within the broader context of soluble Zintl anions of silicon and metalloid clusters. A structural parameter is introduced as a quantitative measure to characterize the “hemispheroidality” of an unsubstituted vertex of a siliconoid.

Graphical abstract: Stable unsaturated silicon clusters (siliconoids)

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Publication details

The article was received on 15 Mar 2018, accepted on 11 Apr 2018 and first published on 12 Apr 2018

Article type: Frontier
DOI: 10.1039/C8DT01009A
Citation: Dalton Trans., 2018,47, 7104-7112
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    Stable unsaturated silicon clusters (siliconoids)

    Y. Heider and D. Scheschkewitz, Dalton Trans., 2018, 47, 7104
    DOI: 10.1039/C8DT01009A

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