Construction of capsule-like coorporative molecular recognizing structures from saccharide-recognizing host molecules

By applying artificial host molecules as parts, higher-order structures such as capsule-like and fibril structures have been built. Coordinative groups were introduced on the ortho positions of triphenolic host molecules, and the product tridentates were treated with a Pd(II) precursor to give M3L2-type capsule-like complex, which showed host ability. Macrocyclic host molecules consisted of 2,6- and 3,6-pyridylene rings were observed to self-associate by pi-stacking, and AFM images showed fibril structures. Tricationic derivative incorporated melamine with self-aggregate into cotton-like structure.