[Synthesis and bacteriostatic activity of new thiosemicarbazone derivatives--amino mercaptotriazole Schiff bases].

4-amino-3-(furan-2)-5-mercapto-1,2,4-triazole (Ia) and its ten Schiff bases derived from Ia with different aldehydes were synthesized. All the compounds were screened for activity against seven bacteria and three fungi. Most compounds were found to possess different inhibition effect on some bacteria and fungi. The azomethine group of Schiff bases is the active functional group and the substituted groups on the phenyl ring had definite effect on the bacteriostatic and fungistatic activities. 4-(5-Nitrofurfurylideneamino)-3-(furan-2)-5-mercapto-1,2,4-tria zol e (Ik) showed the most powerful antibacterial activity and broad antibacterial spectrum, while 4-salicylideneamino-3-(furan-2)-5-mercapto-1,2,4-triazole possessed strong activity against fungi.