Ethynyl phenothiazines are oxidatively coupled to symmetrical dumbbell-shaped butadiynylbridged diphenothiazines in good yields. These molecules show intense absorption bands, intense blue-green luminescence with large Stokes shifts, and reversible oxidation potentials in the anodic region. Thermally, these butadiynes do not undergo topochemical polymerization, but oligomerizations to oligomeric polycyclic heterocycles with complex structures in the melt. STM images of two representatives on HOPG (highly oriented pyrolytic graphite) show the formation of monolayers adsorbed by attractive π-π interactions.
乙炔苯并噻吩可以在良好的收率下氧化偶合成对称哑铃形的丁二炔桥联二苯并噻吩。这些分子显示出强烈的吸收带、强烈的蓝绿色发光和大的斯托克斯位移,以及在阳极区可逆的氧化电位。在热力学上,这些丁二炔不会发生拓扑化学聚合,但在熔融状态下会发生寡聚化反应,形成复杂结构的寡聚多环杂环化合物。在高度定向的热解石墨上的STM图像显示,两种代表物质通过有吸引力的π-π相互作用形成吸附单层。