Conjugated oligomers with rigid, fused-ring structure are of interest for organic field-effect transistors where strong π-π interaction between adjacent molecules is required to obtain high charge carrier mobilities. Dibenzo[b,b′]thieno[2,3-f:5,4-f′]bis[1]benzothiophene (DBTBT) has been synthesized by a novel route, the key step of which is the acid-induced intramolecular cyclization reaction of aromatic methyl sulfoxides. Field-effect transistors (FETs) with thin, polycrystalline DBTBT films deposited by vacuum sublimation exhibit high field-effect mobilities of 0.15 cm
2
(Vs)
–1
and ON-OFF current ratios >10
6
. The coupling reaction is not regioselective and different regioisomers have been identified. Degraded FET performance is observed when the sublimed films contain a mixture of different isomers.
具有刚性熔环结构的共轭低聚物对有机场效应晶体管很有意义,在这种晶体管中,相邻分子之间需要有很强的π-π相互作用,以获得很高的电荷载流子迁移率。二苯并[b,b′]
噻吩并[2,3-f:5,4-f′]双[1]
苯并噻吩(DBTBT)是通过一种新路线合成的,其关键步骤是芳香族甲基
硫醚的酸诱导分子内环化反应。采用真空升华法沉积的多晶 DBTBT 薄膜场效应晶体管(FET)显示出 0.15 cm 2 (Vs) -1 的高场效应迁移率和大于 10 6 的导通-关断电流比。耦合反应不具有区域选择性,而且已经发现了不同的区域异构体。当升华薄膜含有不同异构体的混合物时,场效应晶体管的性能会下降。