C opper (II) complexes with ( E )- N ′ (3,5-di-tert-butyl-2-hydroxybenzilidene)-2-hydroxybenzohydrazide, their bactericidal and fungicidal activity

Mononuclear complexes of Copper(II) with ( E)-N′ (3,5-di-tert-butyl-2-hydroxybenzili- dene)-2-hydroxybenzohydrazide (H 3 sahz) 2 , Cu(Hsahz)(H 2 O) and Cu(Hsahz)(DMF) were synthesized. The structure of the complexes was studied by elemental analysis, IR and EPR spectroscopy, and single-crystal X-ray analysis. It was shown that the complexes have a square-planar structure, in which the ligand is tridentate and dianionic. The coordination of Cu(II) ion is formed by the oxygen atom of the phenol group of 3,5-di-tert-butyl salicylic aldehyde, amidic oxygen atom is in enolic form, the oxygen atom of the DMF molecule and the nitrogen atom of the azomethine group. When recrystallizing from DMF/acetonitrile/ethanol = 1:2:4 solution, the water molecule in the complex is easily exchanged with the DMF molecule. The results of these studies showed that the complexes have a stronger antibacterial and antifungal effect than the ligand.