The occurrence of planar hexacoordination is very rare in main group elements. We report here a class of clusters containing a planar hexacoordinate silicon (phSi) atom with the formula SiSb3M3+...
The ternary SiB2Be2 cluster is a planar tetracoordinate silicon (ptSi) system and features 2π/2σ double aromaticity. Its 14-electron count deviates from the 18-electron rule.
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