Synthesis of Novel Low-band-Gap Thiophene-based Oligomers and Copolymers

<正>1 Results In this contribution,the synthesis and characterization of low-band-gap oligothiophenes and copolymers based on fluorene and thiophene units are reported.First,5,5′-dibromo derivative of 1 was synthesised and used as a building block for synthesis of quinquethiophene and septithiophene analogues of 1 and the synthesis of a novel low band-gap polymer - soluble alternating copolymer 3,which was prepared by the Suzuki coupling of 5,5′-dibromo derivative of 1 with bis(propane-1,3-diyl) 9,9-bis(2-ethylhexyl)fluorene-2,7-bisboronate.Further,two soluble random copolymers 4 of 3-(3-methylbutyl)thiophene with 3-[2-(pyren-1-yl)vinyl]thiophene were prepared by Grignard metathesis copolymerization of corresponding dibromo monomers.See Fig.1.