Supramolecular organic frameworks of cucurbit[n]uril-based [2]pseudorotaxanes in the crystalline state

Three novel supramolecular organic frameworks (SOFs) were constructed from cucurbit[n] uril-based [2] pseudorotaxanes by orthogonal and/or parallel pi-pi interactions between 4,4'-bipyridin-1-ium units. In the crystal structure, [2]pseudorotaxane (CB[6].1) formed an interwoven Chinese knot-like framework with high thermal stability.