Abstract
To investigate the effect of substituents and substitution positions on absorption and fluorescence spectroscopic properties, and self-assembled structures, we designed triangular azo chromophores (1-3) in which three azo groups are connected to a central ring. 1 and 2 where electron-donating methoxy (MeO) groups are attached to para and meta positions, respectively, had different melting temperatures and colors. A dilute para-MeO (1) solution was redder than 3 with electron-withdrawing bromo (Br) groups and liquefied at lower temperatures. The elongated structure formed as a result of the one-dimensional (1D) assembly of 1 showed little fluorescence, whereas the chopstick-shaped structure and the entangled fiber assembled from 2 and 3, respectively, were brightly red fluorescent. Our investigation suggest that the molecular geometry and steric effects play important roles in self-assembly and the resulting fluorescence characteristics.
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