[2PS-130]
Influence of Subtle Substitution on Physical and Fluorescence Properties of Triangular Azobenzene Derivatives
발표자Pyae Myat Phyo Thu (Kongju National University)
연구책임자한민아 (Kongju National University)
Abstract
Three star-shaped azobenzene derivatives with ortho-, meta- and para-methoxy substituents, connected to a central benzene-1,3,5-triol core (3oAz, 3mAz, and 3pAz), were synthesized. Depending on the position of substitution, the chromophores showed distinct melting points ranging from 245-312 °C, with the most sterically crowded compound, 3oAz, displaying the highest melting point. The photoisomerization process was confirmed by UV-Visible absorption and NMR spectroscopic measurements. Aggregates prepared in DMF-H2O, CHCl3-MeOH, and Toluene-MeOH were characterized using optical microscopy (OM), fluorescence optical microscopy (FOM), and scanning electron microscopy (SEM). The typical one-dimensional self-assembled structures formed in the triangular framework exhibited red color emission. Moreover, the concentration-dependent spectral changes observed in 3mAz chromophore indicate how subtle structural modification can influence the photophysical properties of the molecules.