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Background: In recent years, the uses of in situ reaction monitoring have expanded. ReactIR is one of the in situ reaction monitoring techniques used to understand chemical reactions. The reductive amination of Schiff base formed in situ, by treating salicylaldehyde and diethylene triamine using sodium borohydride in methanol, was completed within 28 min and monitored by ReactIR. Materials and Methods: Zinc complexes of diethylene triamine, Schiff base, and their reductive amination products were synthesized using 1:1, 1:2, and 1:3 mole ratios of ligand–zinc chloride at room temperature. Results and conclusion: The formation of the product was confirmed using IR spectra. All these complexes showed photoluminescence in the blue region.