New melamine based ligand3 with pyrene as a fluorophore is synthesized and characterized. The sequential addition of Au3+ ions and ascorbic acid to the solution of 3 in EtOH–H2O (9.5:0.5 v/v) generates gold microparticles (AuMPs). However, the particle size distribution and fluorescence behaviour on sequential additions are different and contribute to the construction of a new logic based molecular dual channel keypad lock system.
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