| 초록 |
Recently some of researchers have reported the silicon substituents known as stabilizing adjacent carbanionic centers due to the effective hyperconjugation between the negatively charged carbon centers and the adjacent silyl groups of thiophene, or aryl derivatives of conjugated polymers. Silole (sila-2,4-cyclopentadiene)-containing polymers is an example. The exocyclic Si-C σ*-orbital effectively mixes with the π*-orbital of the butadiene fragment to afford a low-lying LUMO and a relatively small band gap. Furthermore, introduction of silicon stabilizes the diene HOMO level compared to the carbon counterparts which might be enhancing the ambient stability of silole polymer-derived TFTs. Hence we have synthesized a new monomer 2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)dibenzosilole, and prepared a variety of copolymers with different monomers such as 1,4-benzo[c][1,2,5]thiadiazole, 2,7-dibromo-9,9-dioctylfluorene and substituted thiophenes. |
