Chemistry of σ Electron Systems Based on Inverted σ-bonded Compounds

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We focused on "inverted σ bonds" that show unusual geometry and electronic properties and we synthesize several heavier group-14 element compounds bearing the inverted σ bonded compounds as their components. We have successfully prepared a series of functionalized bicyclo[1.1.1]pentasilanes that are one of the smallest molecular silicon cluster. Using the bicyclopentasilane units we successfully synthesized a series of persila[n]staffanes and revealed remarkable conjugation between the silicon cages. We also synthesized a dimer of 1,3-disila- bicyclo[1.1.0]butane which has an inverted Si-Si σ bond between the bridgehead silicon atoms. UV-vis spectrum and DFT calculations of the dimer show that significant interactions exist between the bridgehead Si-Si bond in the disilabicyclobutane units.