Trisphenalenyl-Based Neutral Radical Molecular Conductor

We report the preparation, crystallization, and solid-state characterization of the first member of
a new family of tris(1,9-disubstituted phenalenyl)silicon neutral radicals. In the solid state, the radical packs
as weak partial π-dimers with intermolecular carbon···carbon contacts that fall at the van der Waals atomic
separation. Magnetic susceptibility measurements indicate ∼0.7 Curie spins per molecule from room
temperature down to 50 K, below which antiferromagnetic coupling becomes apparent; the compound has
a room-temperature single-crystal conductivity of σRT = 2.4 × 10-6 S cm-1.