A novel dialkylammonium salt, 1.PF6, bearing a pyridyl group has been prepared and characterised by x-ray crystallography: triclinic space group P-1, a = 8.8141(1), b = 9.8902(2), c = 10.2611(1), angstrom and alpha = 82.008(l)degrees, beta = 85.212(1)degrees, gamma = 71.058(l)degrees, Z = 2, R = 0.0542 for 3902 independent reflections. The hydrogen-bonded tape generated within the crystal lattice is augmented by water molecules between the divided units in an N-H center dot center dot center dot O and O-H center dot center dot center dot N-py manner. The nature of the [2]pseudorotaxane formed upon the addition of DB24C8 to 1.PF6 (K-a = 2293 M-1) is characterised in the solid state (monoclinic space group P 2(1)/c, a = 14.3808(4), b = 15.0194(4), c = 18.2599(6), angstrom and beta = 95.723(1)degrees, Z = 4, R = 0.0766 for 9313 independent reflections) by hydrogen bonds between NH2 and CH2 groups of the guest with polyether oxygens of the crown ether. These hydrogen bond distances vary with close contacts between 2.01 and 2.58 angstrom H-1 NMR spectroscopy and mass spectrometry further support the presence of the [2]pseudorotaxane in solution.