Syntheses, crystal structures, and Jack bean urease inhibitory activities of copper(II) complexes derived from 4-tert-butyl-N′-(1-(pyridin-2-yl)ethylidene)benzohydrazide

Abstract

Two new copper(II) complexes, [CuL(HL)]·ClO₄ (1) and [Cu₂Br₂L₂]·0.85H₂O (2), where L is the monoanionic form of 4-tert-butyl-N′-(1-(pyridin-2-yl)ethylidene)benzohydrazide (HL), have been prepared. The complexes were characterized by infrared and UV–vis spectra, and single crystal X-ray diffraction. Complex 1 is a mononuclear copper(II) species and 2 is a bromido-bridged dinuclear copper(II) species. The Cu ion in 1 is in an octahedral coordination mode and that in 2 is trigonal-bipyramidal. The Jack bean urease inhibitory assay indicated that 2 is active, with IC₅₀ value of 20.6 ± 2.3 μmol L⁻¹, while 1 is inactive. Molecular docking of 2 with Jack bean urease was studied.

Keywords:

• Hydrazone
• copper complex
• crystal structure
• urease inhibition
• molecular docking