The crystal structures of four pentakis-tert-butyl hexa-peri-hexabenzocoronenes (HBCs), each with an additional sixth substituent namely iodide, methoxy, formyl, and nitro, are presented. We show that the additional substituent has a significant impact on the packing in the solid state and the data obtained can be utilised for crystal engineering. By introducing an electron accepting substituent it was possible to achieve columnar arrangements that were previously unknown for such highly tert-butylated HBCs. In this way we provide insight into the aggregation behaviour of nanographenes with sterically highly shielded edges.

中文翻译：

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立体屏蔽六-六-六苯并异戊二烯的晶体工程

四个pentakis-晶体结构叔丁基六围-hexabenzocoronenes（负担沉重国家），每个具有一个额外的第六取代基即碘，甲氧基，甲酰基和硝基，被呈现。我们表明，额外的取代基对固态堆积有重要影响，并且获得的数据可用于晶体工程。通过引入电子接受性取代基，可以实现以前对于这种高度叔丁基化的HBC而言未知的柱状排列。通过这种方式，我们可以洞悉具有高度屏蔽边缘的纳米石墨烯的聚集行为。