Novel carbazole-based [6]helicenes fused with an azine ring (pyridine, pyrazine or quinoxaline) have been prepared through a five-step synthetic sequence in good overall yields. Commercially available 2,3-dihaloazines were used as starting materials. To discern the effect of merging an azine moiety within a helical skeleton, the X-ray structures, UV–vis absorption and fluorescence spectra of the helicenes were investigated and compared to that of the parent carbazole-based [6]helicene (7H-phenanthro[3,4-c]carbazole).

中文翻译：

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咔唑环与嗪环稠合的合成，晶体结构和性能

已经通过五步合成序列以良好的总收率制备了与嗪环（吡啶，吡嗪或喹喔啉）稠合的基于咔唑的新型[6]螺旋酮。使用可商购的2，3-二卤嗪作为起始原料。识别出一个螺旋形的骨架内合并吖嗪结构部分的作用下，X射线结构，UV-VIS的helicenes的吸收和荧光光谱进行了调查，相比于母体基于咔唑的[6]螺烯（7 ħ -菲[3,4- c ]咔唑）。