Chain Polyamine Axis Material Synthesis Cucurbituril Supramolecular

Nowadays supramolecular chemistry has become one of the hot fields of chemical research.Just as there is a field of molecular chemistry based on the covalent bond,there is a field of supramolecular chemistry,the chemistry of molecular assemblies and of Host-Guest Chemistry,Molecular Recognition. Cucurbit[n]urils are cyclic methylene-bridged glycoluril oligomers whose shape resembles a pumpkin.The defining features of cucurbit[n]urils are their two portals lined by carbonyl groups that provide entry to their hydrophobic cavity.Due to their special structure,cucurbit[n]urils are becoming a series new host after crown ether, cyclodextrin and calixarene,and are one of the important investigations of the supramolecular chemistry.In the first party of the paper,N,N'-bis(n-pyridyl-methyl)-1,m-xanediamine were synthesized.The structures and optical properties of host-guest of TMeQ[6]with those guests have been investigated by ~1H NMR spectroscopy,UV-absorption spectroscopy and single crystal X-ray diffraction determination.The experimental results reveal that ~1H NMR data and Crystallographic data for the same system can be well fitted to the same binding model.Our strategy involves preparation of dumbbell or pseudorotaxane of TMeQ[6]with the selected guest respectively,and then form a polyrotaxane through the intermolecular interactions,such asπ…πstacking or C-H…πinteraction,ion-dipole interaction and hydrogen bonding.In the second party of the paper,the interaction structures and optical properties of host-guest of Q[n=6,7,8]and TMeQ[6]with N,N'-bis(n-pyridylmethyl)-1,4-benzenedimethylamine have been investigated by using ~1H NMR technique, UV-absorption spectroscopy and single crystal X-ray spectrophotometry.The experimental results reveal that Q[n]-guest systems all fitted to a 1:1 binding model.