Photoinitiated Electron Transfer in Zinc Porphyrin–Perylenediimide Cruciforms and Their Self-Assembled Oligomers
作者:Sarah M. Mickley Conron、Leah E. Shoer、Amanda L. Smeigh、Annie Butler Ricks、Michael R. Wasielewski
DOI:10.1021/jp311067q
日期:2013.2.21
(D2-A-A′2) molecules, 1 and 2, in which D = zinc 5-phenyl-10,15,20-tripentylporphyrin (ZnTPnP) or zinc 5,10,15,20-tetraphenylporphyrin (ZnTPP), respectively, A = pyromellitimide (PI), and A′ = perylene-3,4:9,10-bis(dicarboximide) (PDI), were prepared to study self-assembly motifs that promote photoinitiated charge separation followed by electron and hole transport through π-stacked donors and acceptors
两个X形,十字形电子供体2端受体-受体' 2(d 2 -AA' 2)分子,1和2,其中D =分别为5-苯基-10,15,20-三戊基卟啉锌(ZnTPnP)或5,10,15,20-四苯基卟啉锌(ZnTPP),A =均苯四甲酰亚胺(PI),A'=-准备了3,4:9,10-双(二甲叉酰亚胺)(PDI)来研究自组装基序,这些基序促进光引发的电荷分离,然后促进电子和空穴通过π堆叠的供体和受体传输。选择PDI二次电子受体是因为它们倾向于在溶液中形成自定序的π堆叠组装体,而选择ZnTPnP和ZnTPP供体来测试外围取代基空间相互作用对十字形π堆叠特性的影响。在甲苯溶液中的小角度和广角X射线散射测量表明1当[ 1 ]≅10 –5 M时,组装成具有平均5±1个分子的π堆叠结构,而2个仍为单体。的π堆叠结构的光激发1个中形成的结果ZnTPnP •+ -PI-PDI • -在τ CS1 = 0.3皮秒,这是近100倍快于形成ZnTPnP的•+