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The present work describes the syntheses and antimicrobial activity studies of a series of novel Schiff bases (4a–4i) and their Mannich bases (5a–5h) starting from 4-amino-3-(N-phthalimido-methyl)-1,2,4-triazole-5-thione (3). All the synthesized compounds were characterized by IR, 1H-NMR, 13C-NMR, and MS. All the synthesized compounds were screened for four Gram-negative strains, one Gram-positive strain of bacteria, and one diploid fungal strain. In general the antimicrobial activity increased remarkably on the introduction of azomethine functionality in parent triazole (3). The antimicrobial activity further improved when morpholine group was added to them except for Enterobacter cloacae, where loss of activity was observed. The results are promising and show that the fine tuning of the structures (5a, 5b, 5e, 5f, and 5h) can lead to some new antimicrobial compounds

Synthesis, Characterization, and Biological Activity of Novel Schiff and Mannich Bases of 4-Amino-3-(N-phthalimidomethyl)-1,2,4-triazole-5-thione