Cu(II) complexes with 5-tert-butyl-3-(pyrrolidine-1-ilmethyl)-1,2-dihydroxybenzene (I), 5-tert-butyl-3-(piperidine-1-ilmethyl)-1,2-dihydroxybenzene (II), 5-tert-butyl-3-(azenone-1-ilmethyl)-1,2-dihydroxybenzene (II), 5-tert-butyl-3-(morpholine-1-ilmethyl)-1,2-dihydroxybenzene (IV), and 5-tert-butyl-3-(methylpiperazine-1-ilmethyl)-1,2-dihydroxybenzene (V) have been synthesized and characterized by means of elemental analysis, TG/DTA, FT-IR, ESR, UV-Vis spectroscopy and conductivity measurements. According to the data obtained, the compounds I–V coordinate in their singly deprotonated forms in an O,N-bidentate fashion. The synthesized complexes have the composition described by the general formula CuL₂ and are characterized by square planar geometry of their coordination
cores CuO₂N₂. The Cu(II) complexes have been screened for their antimicrobial activity on different species of pathogenic bacteria, fungi, and their antimicrobial potency has been discussed. A high antibacterial activity against Mycobacterium smegmatis and Pseudomonas aeruginosa has been found for the Cu(II) complexes synthesized.

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