Base-induced multi-state fluorescence of a trefoil-shaped salicylaldehyde azine derivative. Issue 39 (7th July 2021) - Taniguchi, Noriho
Abstract : Base-induced four-state fluorescence is demonstrated in a trefoil-shaped salicylaldehyde azine derivative bearing multiple acidic protons. Abstract : A trefoil-shaped salicylaldehyde azine derivative bearing multiple acidic protons displays base-induced multi-state luminescence. The azine was prepared through the reaction of 1, 3, 5-triformylphloroglucinol with 4-methoxysalicylaldehyde hydrazone. 1 H NMR spectroscopy revealed that the azine existed in solution at room temperature as an equilibrium mixture of two geometric isomers. The three-step deprotonation (four-state change) of the azine in solution was confirmed using 1 H NMR, UV-vis absorption, and emission spectroscopy.