Pseudopolyrotaxanes of Cucurbit[6]uril: A Three‐Dimensional Network Self‐assembled by ClO4−(H2O)2 Water Clusters

A pseudorotaxane of cucurbit[6]uril (CB[6]) with guest molecule N,N'-hexamethylenebis (pyrazinyl perchlorate) (BPHP) was synthesized and characterized by 1H NMR spectra, IR, single crystal X-ray diffraction analysis and thermogravimetric analysis. The structure of the pseudorotaxane (CB[6]center dot BPHP) is stabilized by host-guest hydrogen bonds. Self-assembly of the pseudorotaxane produces infinite one-dimensional and two-dimensional networks with intermolecular hydrogen bonds. In the molecular packing of the CB[6]center dot BPHP, ClO4-(H2O)2 water clusters serve as bridges to associate these pseudorotaxanes and form three-dimensional networked pseudopolyrotaxane.