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New series of bis(amino-1,2,4-triazoles ‏)  5a–f  were prepared by the reaction of bis(chloro) diamides  3a–d  with 5-substituted-4-amino-1,2,4-triazoles-3-thiole ( 4a–c ). Reaction of bis(amino) triazoles  5a–d  with the appropriate aldehydes afforded the corresponding Schiff bases  7a–d  in good yields. Similarly, cyclocondansation of bis(amino) triazoles  5a–d  with 1,3-bis(2-formyphenoxy)-2-propanol furnished the desired lariat macrocycles  12a–d . The antimicrobial activities of the prepared bis(amines)  5a–c, e–g , Schiff bases  7a–d, 11a–b  and lariat macrocycles  12a,c,d  were evaluated against series of selected microorganisms. Some of the prepared derivatives showed good antimicrobial activity against gram positive bacteria and gram negative bacteria. The MIC values for some of the tested compound were investigated.

Synthesis and Antimicrobial Activities of Some New Bis(Schiff Bases) and Their Triazole-Based Lariat Macrocycles