Quantitative water encapsulation is reached during the formation process of the open-cage fullerene with a 17-member orifice which is completely blocked by the amide group directly above the orifice. The amide oxygen forms a H-bond with the trapped water. The bond length (O⋅⋅⋅H−O) is 2.859 Å as shown by single crystal X-ray analysis, and the H-bond energy is about −3.83 kcal/mol by theoretical calculation.

中文翻译：

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包封水分子与孔口边缘酰胺部分之​​间含有氢键的开笼富勒烯的合成

在具有 17 元孔的开笼富勒烯的形成过程中实现了定量的水包封，该 17 元孔被直接位于孔上方的酰胺基团完全阻挡。酰胺氧与捕获的水形成氢键。单晶X射线分析表明键长（O···H-O）为2.859 Å，理论计算H键能量约为-3.83 kcal/mol。