Abstract
Coumarin-based new symmetrical bisamide 1 has been designed and synthesised. The bisamide 1 fluorometrically recognises Cu2+ in CH3CN containing 0.06% DMSO by exhibiting an increase in emission upon complexation. In comparison, the isomeric structure 2 also reports the selectivity for Cu2+ under identical condition by showing an opposite mode of emission. In addition, Cu2+ gives rise to a change in colour of the solution of 1, which is clearly visible to the naked eye.
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