| 초록 |
Molecular self-assembly of organic molecules has generated a wide variety of objects from nanoscale or micrometer-scale morphologies. Recently, azobenzenes molecules containing two amide groups and diacetylene groups were found to form self-assembled structures by secondary interactions, hydrogen bondings from amide groups and π-π interaction from azobenzene moieties. They showed gelation behavior in aromatic solvents, and interestingly, they showed morphology changes induced by trans-cis photoisomerization when a THF solution of the molecules was evaporated on a Si wafer with UV light (365 nm). They self-assembled into plate-like structures when the solution was evaporated without UV light, while they formed micro-sized doughnut-like structures with UV light. The structures could be fixed by photopolymerization of diacetylene groups upon UV (254 nm) irradiation. |
