Abstract In this study, some substituted phenylhydrazono-1 H-tetrazol-5-yl-acetonitriles have been synthesized (2a–o, 2a and 2k are known compounds). The synthesized compounds were characterized by spectroscopic methods [Fourier-transform infrared (FTIR), nuclear magnetic resonance (NMR), mass spectroscopy (MS)]. In addition, antimicrobial activities of synthesized compounds were investigated against Bacillus cereus RSKK 863, ...