Influence of Subtle Substitution on Physical and Fluorescence Properties of Triangular Azobenzene Derivatives
발표자
Pyae Myat Phyo Thu (Kongju National University)
연구책임자
한민아 (Kongju National University)
공동저자
Pyae Myat Phyo Thu (Kongju National University), Park Sanghyuk (Kongju National University), 한민아 (Kongju National University)
초록
내용
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.