| 초록 |
Polydiacetylene(PDA)-based systems have served as an attractive model for direct sensing devices due to their colorimetric responses to change in the local environment. We prepared PDA dendritic building blocks made of focal functional group, amide branch for hydrogen bonding, and alkyl periphery with diacetylene moiety. The urethane-amide dendron with diacetylene peripheral units was synthesized via a convergent pathway. Desthiobiotin moiety incorporated at the focal point of diacetylenic dendritic builidng block. The average diameter of the vesicles from dendrons measured by using dynamic light scattering (DLS). Vesicular structures were confirmed by TEM and gel filtration. Supramolecular vesicles induced via self-assembly of dendritic building blocks could be stabilized by in situ photopolymerization of diacetylene moiety. The color change by association/dissociation reactions between avidin and biotin analogues were confirmed by UV-vis spectroscopy, DLS, and TEM. The results on the role of dendritic building block in color changes should be useful for designing reversible colorimetric sensors. |
