Synthesis and Photophysical Properties of Extended π -Conjugated System Containing Si=Si Double Bonds with a New Fused-Type Bulky Ligand

摘要

Incorporation of multiple bonds of heavier main group elements into π-conjugated framework would alter its inherent electronic nature. This approach is believed to provide a new entity of potential materials for organic electronics. However, this chemistry always suffers from a dilemma. Thus, while a steric protection of the highly reactive heavier multiple bonds by bulky ligands is essential for stabilization, the steric bulkiness would cause the skeleton twisted to reduce the extension of π-conjugation. A key for further evolution of this chemistry is undoubtedly to attain a well-defined ligand which can maintain the highly planar π-conjugated framework, as well as protection of the reactive heavier multiple bonds. A few examples of oligomers and polymers comprising heavier multiple bonds in the main chain have only recently been reported, without success of the coplanarity.