The compressed conformations and degree of coiling of 1,ω-diammonio-oligo(ethylene glycol) (OEG) guests have been determined within the internal space of crystalline pyrene box host capsules. It was observed that the longest OEG chains have the tendency to fold in on themselves inside this confined medium. The phenomenon was observed in solution by NMR spectroscopy, and structural proof has been provided
在结晶crystalline盒宿主胶囊的内部空间中,已确定了1,ω-二
铵-低聚(
乙二醇)(O
EG)客体的压缩构象和卷曲度。据观察,最长的O
EG链倾向于在这种受限介质中自行折叠。通过NMR光谱在溶液中观察到该现象,并且通过单晶X射线衍射提供了结构证明。与先前报道的封装
烷烃链的笼子相比,包含O
EG的“ py盒”系统的整体超分子空间排列保持相对不变。但是,可以观察到一些结构和尺寸的变化/适应,以容纳不同大小和形状的螺旋形O
EG客体。