Two novel macrocycles based on triphenylamine (TPA) have been synthesized by McMurry coupling reactions. The cyclic compound 2 consisted of two triphenylamines linked with ethylene bridges bearing two n-butyl chains. The compound 3 was based on N,N,N′,N′-tetraphenylbenzidine (TPD) units with macrocyclic architecture. They were fully characterized by cyclic voltammetry, UV-vis absorption and self-assembly properties. The crystal structure of 2 was determined by X-ray analysis. Atomic force microscope and scanning electron microscope images showed that compound 3 could form interesting fiber-like nanostructures by self-assembly. Both of the compounds can be used as active layers for p-type OFETs. The OFET device based on 2 prepared via a vacuum-deposit method gave a mobility of 2.3 × 10–3 cm2 V–1 s–1 and a current on/off ratio of 105. High quality thin films of 3 were fabricated by spin coating from solution, and gave a mobility of 2.0 × 10–3 cm2 V–1 s–1 with a current on/off ratio of 2 × 105. The results showed that the TPA derivatives with cyclic structures might fit better for OFETs. They may provide promising new choices for organic semiconductors.
                                    通过McMurry耦合反应合成了两种基于
三苯胺(
TPA)的新型大环化合物。化合物2由两个通过
乙烯桥连接的
三苯胺组成,
乙烯桥上带有两个正丁基链。化合物3基于N,N,N′,N′-四苯基
苯胺(
TPD)单元,具有大环结构。通过循环伏安法、紫外-可见光吸收和自组装性质对其进行了全面表征。化合物2的晶体结构通过X射线分析确定。原子力显微镜和扫描电子显微镜图像显示化合物3可以通过自组装形成有趣的纤维状纳米结构。这两种化合物均可用作p型有机场效应晶体管(OFET)的活性层。通过真空沉积法制备的基于化合物2的OFET器件,迁移率为2.3 × 10–3 cm² V–1 s–1,开关比为105。化合物3通过溶液旋涂法制备的高质量薄膜,迁移率为2.0 × 10–3 cm² V–1 s–1,开关比为2 × 105。结果表明,具有环状结构的
TPA衍
生物可能更适合用于OFET。它们可能为有机半导体提供了有前景的新选择。