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A New Cyanofluorene—Triphenylamine Copolymer: Synthesis andPhotoinduced Intramolecular Electron Transfer Processes

机译:新型氰芴-三苯胺共聚物:合成和光致分子内电子转移过程

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摘要

A new 2r-conjugated copoly-mer, namely, poly{cyanofluore-alt45-(/V,N'-diphenylamino)phenyleneviny-lenell ((CNF–TPA),), was synthesizedby condensation polymerization of 2,2'-(9,9-diocty1-9H-fluorene-2,7-diy1)diace-tonitrile and 5-(N,AP-diphenylamino)-benzene-1,3-dicarbaldehyde by usingthe Knoevenagel reaction.By design,diphenylamine,alkylfluoreneand poly(p-phenylenevinylene)linkages were combined to form a (CNF–TPA),copolymer which exhibits high thermalstability and glass-transition tempera-ture. Photodynamic measurements inpolar benzonitrile indicate fast and effi-cient photoinduced electron transfer s~(-1)) from triphenylamine (TPA)to cyanofluorene (CNF) to produce thelong-lived charge-separated state(90 μs). The finding that the charge-re-combination process of (CNF~-TPA~+)_n is much slower than the chargeseparation in polar benzonitrile sug-gests a potential application in molecu-lar-level electronic and optoelectronicdevices.
机译:通过2,2'-(9的缩聚反应,合成了一种新的2r共轭共聚单体,即聚{氰基氟代-alt45-(/ V,N'-二苯基氨基)亚苯基乙烯基-烯丙基((CNF-TPA),)通过Knoevenagel反应制得1,9-二辛基1-9H-芴-2,7-diy1)二甲苯腈和5-(N,AP-二苯氨基)-苯-1,3-二甲醛。通过设计,二苯胺,烷基芴和聚(p -苯基亚乙烯基)键合并形成具有高热稳定性和玻璃化转变温度的(CNF-TPA)共聚物。极性苄腈的光动力学测量表明,三苯胺(TPA)向氰基芴(CNF)快速有效地进行了光诱导的电子转移s〜(-1),从而产生了长寿命的电荷分离态(90μs)。 (CNF〜-TPA〜+)_ n的电荷复合过程比极性苄腈中的电荷分离慢得多的发现建议在分子级电子和光电器件中有潜在的应用。

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