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Researchers have computationally predicted small silicon-containing clusters in which one silicon atom sits at the center of six contacts in a perfectly planar structure. The proposed clusters, SiSb3M3+ (M = calcium, strontium, or barium), are calculated to have a D3h global-minimum geometry. They have not been reported as experimentally synthesized or detected; the paper presents experiments as future possibilities.
What the predicted silicon clusters are
Chen and colleagues’ 2022 study describes positively charged clusters with the composition SiSb3M3+, where M is calcium (Ca), strontium (Sr), or barium (Ba). In each calculated structure, silicon lies at the center of a planar arrangement of three antimony atoms and three alkaline-earth metal atoms. The publisher identifies the predicted global minimum as D3h (1A1′).
“Hexacoordinate” means the central silicon has six neighboring contacts. It does not mean this is a piece of bulk silicon, a silicon wafer, or an experimentally established material: it is a theoretical prediction about particular charged clusters. The Chemical Science paper reports the calculated structures and bonding interpretation.
Why six contacts can be stable in the predicted structure
The authors attribute the stability to contributions from both the antimony and metal atoms, rather than to six equivalent bonds. The study describes Si–Sb interactions as significantly stronger than Si–M interactions. The weaker Si–M contacts still contribute to stability through a combination of electrostatic and covalent attraction.
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The paper reports Si–M stabilization energies ranging from −27.4 to −35.4 kcal mol−1. This is an aggregate range reported in the article’s abstract; it does not establish which endpoint belongs to Ca, Sr, or Ba. The abstract also does not provide enough methodological detail to interpret this range as an experimental measurement or to compare individual metal variants quantitatively. See the RSC article for the study’s reported result.
Why heavier metals matter
The authors propose that the heavier alkaline-earth atoms can use vacant d atomic orbitals in bonding. In their account, this helps stabilize the cluster’s outer ring and contributes to covalent interaction with silicon. The paper contrasts this with related clusters containing lighter main-group atoms: although those homologues can also have D3h global minima, the abstract says repulsive electrostatic interactions dominate and their Si–M contacts remain repulsive.
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Ligand protection preserves the predicted arrangement
The calculations also consider clusters protected by six ligands: either six N-heterocyclic carbene (NHC) ligands or six benzene (Bz) ligands. The authors report that these ligand-protected forms retain the planar geometry and attractive character of the silicon contacts. Their formulas are SiSb3M3(NHC)6+ and SiSb3M3(Bz)6+.
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Ligand protection is part of the proposed route toward making such structures experimentally accessible; it is not evidence that the protected clusters have already been synthesized. The paper describes bare clusters as candidates for gas-phase detection and protected clusters as candidates for large-scale synthesis.
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What has—and has not—been demonstrated
This is a computational prediction, not a report of a laboratory observation. The 2022 paper proposes gas-phase detection for bare clusters and synthesis for ligand-protected clusters, but the cited article abstract does not report either outcome. Chemistry World’s 1 July 2022 coverage said no planar hexacoordinate silicon clusters had then been experimentally reported; that is a statement about the status at that time, not confirmation of the current experimental status. Chemistry World’s contemporaneous report provides that historical context.
Accordingly, “stable” here refers to the calculated structures and their predicted energetic and bonding characteristics. The accessible abstract does not establish a measured lifetime, kinetic barrier, or successful isolation. Nor does its aggregate energy range support ranking the calcium, strontium, and barium versions against one another.
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Why the prediction is notable
Silicon is commonly associated with structures in which it has four neighboring atoms. This calculation instead proposes a planar cluster with six contacts around silicon, stabilized by a specific combination of antimony and heavier alkaline-earth atoms. Its significance is therefore a predicted bonding arrangement in a carefully defined molecular cluster—not a change to the established properties of ordinary silicon materials.
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