| 초록 |
To fabricate the organic security materials with instantaneous handling of both transparency and fluorescence, a monopyrene core linked by amide bonds with dendritic alkyl chains (MMAD) was newly designed and synthesized. As a result of the thermal and optical analysis, the phase-transition behavior of MMAD was identified. Additionally, 2D WAXD and TEM analyses were conducted to investigate the molecular packing structure, and it confirmed that MMAD has polymorphic superstructures. These structures were controlled by the competition between π−π interaction and H-bonding. There are changes in optical properties of MMAD due to the kinetic control of polymorphic superstructure. The fluorescence intensity and visibility of MMAD can be tuned by external stimuli and processing ways. Optically tunable materials caused by kinetic control of polymorphic superstructure can be a great method for developing secret ink. This work was supported by Mid-Career Researcher Program (2021R1A2C2009423). |
