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]·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]·BPHP, ClO₄⁻(H₂O)₂ water clusters serve as bridges to associate these pseudorotaxanes and form three-dimensional networked pseudopolyrotaxane.

A novel series of morpholinium salts, N-alkyl-N-methylmorpholinium salts (Mor_1,nX, n=10, 12, 14, 16, X=BF₄⁻) and Brönsted acidic N-hexadecyl morpholinium salts (Mor₁₆X, X=BF₄⁻, CH₃SO₃⁻ and p-CH₃C₆H₄SO₃⁻) were synthesized. And their mesomorphic properties were characterized by differential scanning calorimetry and polarized optical microscopy. The single crystal X-ray diffraction and the detailed temperature dependent small angle X-ray diffraction were used to investigate the molecular structure of Mor_1,16BF₄. These results suggested that the favor the formation and stabilization of mesogenic compounds. And hydrogen bonds between the BF₄⁻ and morpholinium cations contributed to the conformational change of phase transition of Mor_1,16BF₄.