%0 Journal Article
%T NMR study on self-assembled cage complex of hexamethylenetetramine and cucurbit[n]urils
%A Yongqiang Shen
%A Saifeng Xue
%A Yunjie Zhao
%A Qianjiang Zhu
%A Zhu Tao
%J Chinese Science Bulletin
%@ 1861-9541
%D 2003
%I 
%R 10.1007/BF02901758
%X Self-assembled complexes between cage compounds cucurbit[n = 5¨C8]urils and hexamethylenetetramine were studied by using NMR techniques. Experimental results reveal that hexamethylenetetramine can lid cucurbit [5] uril to forming self-assembled capsules in which nothing is encapsulated yet; the cavity of the cucurbit[7]uril can accommodate a hexamethylenetetramine molecule to form a selfassembled host-guest inclusion. Moreover, both the cavity interaction of the cucurbit[7]uril with hexamethylenetetramine¡¤HCl and the portal interaction of the dipole carbonyl of the cucurbit[7]uril with hexamethylenetetramine¡¤HCl lead to form self-assembled capsules in which the hexamethylenetetramine¡¤HCl are encapsulated in the hexamethylenetetramine¡¤HCl ¡°lidded¡± cucurbit[7]uril. Although the structures of the portal and cavity to cucurbit[5]uril are similar, there is no obvious interaction between decamethylcucurbit[5]uril and hexamethylenetetramine, and also between cucurbit [6]uril or cucurbit[8]uril and hexamethylenetetramine.
%K cucurbit[5
%K 6
%K 7
%K 8]uril
%K hexamethylenetetramine
%K self-assemble
%K encapsulates
%K host-guest complex
%U http://link.springer.com/article/10.1007/BF02901758