Crystal structure of aqua{(1-(6-carboxylatopicolinoyl)-2-(pyridin-2- ylmethylene)hydrazin-1-ido]-κ4N,N',N'',O}, C13H10CuN4O4

Abstract

Experimental detailsThearomaticHatoms were placed in geometricallyidealized positionsand constrainedtorideontheir parent atoms,with C-H = 0.93 Åand U iso (H) =1.2U eq (C), respectively [10]. DiscussionThe heterocyclic acyl-hydrazones have a-NH-N=CH-group andanadditional C=Odonor site,whichdetermine the versatility and flexibility of these compounds, and they attracted considerable attention of bioinorganic and medicinal chemists due to their versatile coordination behaviour and wide range of pharmacological properties [1][2][3][4]. The heterocyclic acyl-hydrazones coordinatingwith transition metals ions display tridentatecoordination through pyridine nitrogen,carbonyl oxygen andazomethinic nitrogen atoms. Cu(II)c omplexesi nvolving heterocyclic hydrazones exhibitedw ide range of biological and pharmaceutical activitiesthatcontainDNA binding and cleavage,antimicrobial, anticancerand antioxidantbehavior [5][6][7][8]. Herein, we will report anew heterocyclic hydrazone Cu complex [CuL(H 2 O)]. Thispaper is part of an ongoing investigation to study the interaction of transition metals with hydrazone ligands, and also expect to show different biological activity in the future experiments. The complex consists of one Cu(II) ion, one heterocyclic ligand and one H 2 Omolecule (cf. figure). The Cu(II) ion is five-coordinated in a pentagonal pyramid geometry. In the equatorial plane, the coordination sites consist of one oxygen atom (O2) and three nitrogen atoms(N1, N2 and N4) from one ligand with the Cu-O/N bond distance ranging in 1.903(2)-2.018(2) Å. Theaxile coordination atom is occupied by one oxygen atom (O4) from one H 2 Omolecule with the Cu-O4 distance of 2.371(2) Å. Thecentral Cu deviates from the least plan [N1, N2, N4, O2] of 0.159 Åa nd the Cu-O4 axile is nearly perpendicular to the plane.