Hexacoordinate Si(pincer)2 complexes are being developed as charge transport and emitting layers in organic electronic device applications including OLEDs, OPVs, and OFETs. The complexes exhibit excellent thermal and chemical stability. They also exhibit rationally tunable electronic and optical properties attractive for device applications. Many of these complexes can be thermally evaporated and deposited as high-quality thin films with promising charge mobilities. For example, 2,6-bis(benzimidazol-2′-yl)pyridine (bzimpy) was reacted with SiCl4 to generate Si(bzimpy)2. Si(bzimpy)2 emits in solution with a λmax = 510 nm, and thin films of Si(bzimpy)2 possess an average electron mobility of 6.3 × 10−5 cm2 V−1 s−1. The HOMO of Si(bzimpy)2 is located primarily on the benzimidazole moiety while the LUMO is localized primarily on the pyridine. Synthetic modifications of the bzimpy framework with electron donating groups (Me and MeO) allow for rational tuning of the HOMO and LUMO levels and consequently the optical and electronic properties. The synthesis, properties, and device applications of Si(pincer)2 complexes will be discussed.

Si(pincer)2 complexes: Tunable materials for organic electronic devices

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.