Crystallization-driven self-assembly of three macrocyclic members of the cucurbit[n]uril family is reported. The largest cucurbit[10]uril serves as a host for the smallest cucurbit[5]uril forming an inclusion complex of the macrocycle-within-macrocycle type. This supramolecular ensemble undergoes cocrystallization with cucurbit[7]uril. Such unusual cocrystallization is explained by the strong tendency of all cucurbit[n]urils to associate via multiple C–H⋯O hydrogen bonds.

中文翻译：

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葫芦[n] uril同系物三合一晶体

葫芦[ n ] uril家族的三个大环成员的结晶驱动自组装的报告。最大的葫芦[10]尿素充当最小的葫芦[5]尿素的宿主，形成大环内-大环化合物类型的包合物。该超分子集合与葫芦丝[7] uril共结晶。所有葫芦[ n ] urils通过多个C–H⋯O氢键缔合的强烈趋势解释了这种异常的共结晶现象。