Synthesis, crystal structures and urease inhibition of copper(II), manganese(III) and nickel(II) complexes derived from 2-bromo-<i>N′</i>-(2-hydroxy-4-methoxybenzylidene) benzohydrazide

In this work, three new copper(II), manganese(III) and nickel(II) complexes, [Cu₂(HL)₂(OH₂)₂](NO₃)₂·2H₂O (<b>1</b>), [MnLL′(CH₃OH)] (<b>2</b>) and [Ni₂(HL)₂(OH₂)₂(DMF)₂](ClO₄)₂ (<b>3</b>), where L is the dianionic form of 2-bromo-<i>N</i>′-(2-hydroxy-4-methoxybenzylidene)benzohydrazide (H₂L), HL is the deprotonated form of H₂L, and L′ is the deprotonated form of 4-methoxysalicylaldehyde, were prepared and characterized by physico-chemical methods.

Molecular structures of the complexes have been determined by single crystal X-ray crystallography. In complexes <b>1</b> and <b>3</b>, the hydrazone ligands coordinated to the metal atoms through phenolate oxygen, imino nitrogen and carbonyl oxygen atoms. In complex <b>2</b>, the hydrazone ligands coordinated to the manganese atom through phenolate oxygen, imino nitrogen and enolate oxygen atoms.