(S)-BINOL cored dendrimers 1–3 with rhodamine B surface group and triazole bridging unit were synthesized up to second generation in good yield by convergent synthesis through click chemistry.

Novel triazole bridged dendrimers with rhodamine B derivative as surface groups have been achieved using click chemistry by both divergent and convergent approaches. Rhodamine B decorated dendrimers 1, 2, and 3 were synthesised up to the second generation with spirolactam grafted at the terminal. The UV and fluorescence intensity increases with the increase in the dendritic generation. The synthesised rhodamine B decorated dendrimers show significant antioxidant behaviour compared with the standards butylated hydroxy toluene (BHT) and gallic acid when tested by 1,1-diphenyl-2-picryl hydrazyl (DPPH) radical scavenging assay and hydroxyl radical scavenging assay methods, respectively. Rhodamine B decorated higher generation dendrimers exhibit better antioxidant activity than the lower generation dendrimers due to the presence of a greater number of triazole branching units and rhodamine B derivative surface units.

Rhodamine B decorated dendrimers 1–6 were synthesized by a convergent approach using click chemistry. The zeroth generation dendrimer 1 (G0) and the first generation dendrimer 4 (G1) showed better antibacterial activity than the other dendrimers.

Rhodamine B decorated, mesitylene cored and methylene pphenoxy bridged dendrimers 1-3 were synthesized upto second generation in good yield by divergent methodology. The intensity of the UV-Visible absorption and emission band increases on increasing the number of the dendritic wedges.The antibacterial activity of the dendrimer 3 was found to be better than the lower generation dendrimers 1 and 2 against both the gram positive and gram negative bacteria such as B. subtilis, S. aureus, E. coli and P. aeruginosa.[a] J.

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