Photoinduced Phase Transition of Azobenzene-Coupled Benzenetricarboxamide

摘要

1,3,5-Benzenetricarboxamide (BTC) family have been actively explored as supramolecular scaffolds especially for columnar structures.1"12 It is well known that in BTC derivatives the presence of three amide groups that can participate in strong three-fold intermolecular hydrogen bonding and the planar aromatic core could assist in better columnar packing through π-π stacking interactions. Addition of functional groups to BTC derivatives makes these supramolecular scaffolds more intriguing. For instance, we reported a thermosensitive BTC system by introduction of hydrophilic crown ether moieties to the BTC core. The crown ether containing BTC displayed a lower critical solution temperature (LCST) behavior owing to the thermosensitive crown ether groups. More recently, we described a photoresponsive BTC, Azo-BTC, that is derived from an azobenzene chromophore (Figure 1).