Development of Aromatic-Fused Diketophosphanyl-Cored Functional π-Conjugated Molecules

pi-Conjugated organophosphorus compounds represented by phospholes serve as unique building blocks and functional cores for various organic functional materials, due to the unique features such as sigma*-pi* hyperconjugation and P-modulability. Therefore, the development of novel pi-conjugated organophosphorus building blocks and core scaffolds would be of great importance to open up new horizons of phosphorus-containing functional materials. Recently, we have revisited missing pieces of organophosphorus compounds, i.e., aromatic-fused diketophosphanyl compounds, and cultivated their potential use as building blocks for functional organic materials. In this account, our contributions to the development of diketophosphanyl-cored organic materials are described.