Click-Together Azobenzene Dendrons: Synthesis and Characterization

We synthesized 1,2,3-triazole-linked azobenzene dendrons of four generations. No protection−deprotection approach was needed during the generation development via click reaction. The photoisomerization of azobenzene dendrons was studied using UV–vis spectra. The cis isomers of these dendrons were more stable than trans isomers in the dark; however, the cis isomers could be quickly converted to trans forms under visible light exposure in seconds. The trans form could change to cis form reversibly by UV irradiation as well.