Abstract
A hexacoordinate organosilane with a SiC4N2 skeleton has been synthesized from the reaction of a tridentate, dianionic, CNC-diphenylpyridine (DPP) ligand with SiCl4. The complex has a distorted octahedral geometry with short Si-N bond lengths averaging 1.9111(14) Å. The Si(DPP)2 complex is resistant to hydrolysis and thermally robust. Thermally evaporated films of Si(DPP)2 exhibit bipolar charge transport, with electron and hole charge mobilities high enough for device applications (µe = 18 × 10−5 cm2V−1s−1 and µh = 1.1 × 10−5 cm2V−1s−1). Computational modeling indicates electron transport involves a conventional π-delocalized LUMO, but that hole transport involves a delocalized σ-bonded HOMO.
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