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[摘要]：Melamine-linked perylene bisimide dyes (MPBIs) bearing an ethylene or trimethylene group as linker moieties were synthesized, and their self-aggregation and coaggregation with cyanurates through complementary triple hydrogen bonds have been investigated. UV/vis studies revealed that both the MPBIs self-assemble in nonpolar org. solvent through p-p stacking interaction between perylene cores, giving self-aggregates with nearly identical thermal stabilities. Upon addn. of 1 equiv of cyanurate components, however, the stabilities of the resulting aggregates were dramatically changed between the two systems, suggesting the formation of different types of hydrogen-bonded supramol. species. Dynamic light scattering and at. force microscopic studies revealed that the system featuring ethylene linker moieties generates a discrete dimer of MPBI supported by two cyanurate mols., whereas the system featuring trimethylene linker moieties affords extended supramol. polymers hierarchically organizing into nanoscopic fibers. These results demonstrate that it is possible to obtain distinct supramol. species by just changing the no. of carbon atoms at the linker moieties of MPBI components. The present strategy for the fabrication of discrete or polymeric supramol. assemblies should be applicable to other functional p-conjugated mols. |
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