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A series of copper, nickel and zinc complexes, [CuClL] ( 1 ), [CuBrL] ( 2 ), [NiL 2 ] ( 3 ), [ZnL 2 ] ( 4 ) and [Zn 2 I 2 L 2 ] ( 5 ), where L is the deprotonated form of 4-chloro-2-((pyridin-2-ylmethylene)amino)phenol, have been synthesized and characterized by elemental analysis, IR and UV-Vis spectra. The structures of the complexes were further confirmed by single crystal X-ray diffraction. The Cu ions in  1  and  2  are in square planar coordination. The Ni and Zn ions in  3  and  4  are in octahedral coordination. The coordination of the Zn ions in centrosymmetric complex  5  is between square pyramidal and trigonal bipyramidal. The copper complexes have excellent urease inhibitory activity.

Synthesis, crystal structures and urease inhibition of copper, nickel and zinc complexes derived from 4-chloro-2-((pyridin-2-ylmethylene)amino)phenol