Silicon tris(perchloro)dioxolene: a neutral triplet diradical

The reaction of ortho‐quinone with silicon tetraiodide leads to neutral silicon trisdioxolenes in high yield – delivering the unknown oxidized form of triscatecholatosilicate dianions and the first example of open shell semiquinonates connected via a single non‐metal center. Silicon tris(perchloro)dioxolene is a stable diradical with a triplet ground state, as supported by X‐ray diffraction, IR‐, resonance Raman, UV/Vis‐, (VT)EPR‐spectroscopy and Kohn‐Sham broken symmetry computations. Preliminary results suggest that the preferred magnetic ground state can be altered by choice of the substituents.

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