Probing Molecular Wires: Synthesis, Structural, and Electronic Study of Donor-Acceptor Assemblies Exhibiting Long-Range Electron Transfer
作者:Francesco Giacalone、José L. Segura、Nazario Martín、Jeff Ramey、Dirk M. Guldi
DOI:10.1002/chem.200500073
日期:2005.8.5
incorporating pi-conjugated oligo(phenylenevinylene) wires (oligo-PPV) of different length between pi-extended tetrathiafulvalene (exTTF) as electron donor and C60 as electron acceptor has been prepared by multistep convergent synthetic approaches. The electronic interactions between the three electroactive species present in 16-20 were investigated by UV-visible spectroscopy and cyclic voltammetry (CV)
一系列供体-受体阵列(C60-oligo-PPV-exTTF; 16-20),在作为电子供体的pi延伸的四硫富富瓦烯(exTTF)和C60之间掺入了不同长度的pi共轭低聚(亚苯基乙烯撑)线(oligo-PPV)由于电子受体是通过多步收敛合成方法制备的。通过紫外可见光谱和循环伏安法(CV)研究了16-20中存在的三种电活性物质之间的电子相互作用。我们的研究清楚地表明,尽管C60单元通过pi共轭的寡聚PPV框架与exTTF供体相连,但在基态中未观察到明显的电子相互作用。有趣的是,在长达50埃的距离内进行光诱导的电子转移过程,可提供高度稳定的自由基离子对。对于光生成的电荷分离态,在苯甲腈中测得的寿命在数百纳秒(约500 ns)的范围内,与低聚物的长度(即,从单体到五聚体)无关。对于含七聚体的阵列,观察到不同的寿命(4.35微米)。寿命上的这种差异是由oPPV部分的平面度随线长增加而造成的,这是通