Well defined dialkylfluorene/oligothiophene and dialkylfluorene/dithienylvinylene alternating copolymers have been synthesized via the polycondensation of 2,7-dibromo-(9,9-dialkylfluorene) with the appropriate distannylated (oligo)thienylene component according to a Stille-type coupling reaction using tetrakis(triphenylphosphine)palladium [Pd(PPh3)4] as catalyst. The alternate incorporation of the thienylene building blocks leads to the tunability of the photoluminescent properties of the alternating copolymers. The long wavelength absorption and photoluminescence maxima of the copolymers display a subsequent bathochromic shift upon increasing the size of the (oligo)thienylene building block.
合成了定义良好的二烷基
氟烯/低聚
噻吩及二烷基
氟烯/二
噻吩乙烯交替共聚物,采用2,7-二
溴-(9,9-二烷基
氟烯)与适当的双
锡基(低聚)
噻吩单元通过斯蒂尔耦合反应进行聚缩合,催化剂为四
苯基膦钯[Pd(PPh3)4]。
噻吩单元的交替掺入使得交替共聚物的光致发光性质具备可调性。随着(低聚)
噻吩单元尺寸的增加,共聚物的长波长吸收和光致发光峰值显示出随之而来的红移。