Pillararene-based Supramolecular Two-Component Organogels via Multivalent Interactions

An instant pillar[5]arene-based two-component supramolecular organogels based on the self-assembled multivalency concept are described. Mixing low concentrated solutions (< 5 mM) of decaamino pillar[5]arenes with decacarboxylato pillar[5]arene, in various organic solvents, instantaneously gives a gel having an exceptional combination of properties. These organogels were found to be thermally stable (in some cases Tgel > b.p) and thixotropic (a rare feature in such systems). Moreover, these multivalent gelation systems are based on specific molecular recognition and form AB-type organic nanotubes that enjoy a high structural diversity and an intrinsic cavity.