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An EtOH solution of 3-ketobutanehydrazide and salicylhydrazide on refluxing in equimolar ratio forms the corresponding Schiff base, LH 3  ( 1 ). The latter reacts with Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Zr(OH) 2 (IV), MoO 2 (VI), and UO 2 (VI) ions in equimolar ratio and forms the corresponding coordination compounds, [M(LH)(MeOH) 3 ] ( 2 , M = Mn, Co, Ni), [Cu(LH)] 2  ( 3 ), [M′(LH)(MeOH)] ( 4 , M′ = Zn, Cd), [Zr(OH) 2 (LH)(MeOH) 2 ] ( 5 ), [MoO 2 (LH)(MeOH)] ( 6 ), and [UO 2 (LH)(MeOH)] ( 7 ). The coordination compounds have been characterized on the basis of elemental analyses, molar conductance, spectral (IR, reflectance,  1 H NMR, ESR) studies, and magnetic susceptibility measurements. They are nonelectrolytes in DMSO. The coordination compounds, except  3 , are monomers in diphenyl. They are active against gram-positive bacteria ( S. aureus, B. subtilis ), gram-negative bacteria ( E. coli, P. aeruginosa ), and yeast ( S. cerevisiae, C. albicans ).  1  acts as a dibasic tridentate ONO donor ligand in  2–7  coordinating through its both enolic O and azomethine N atoms. The coordination compounds  2  and  3  are paramagnetic, while rest of the compounds are diamagnetic. A square-planar structure to  3 , a tetrahedral structure to  4 , an octahedral structure to  2 ,  6 , and  7 , and a pentagonal bipyramidal structure to  5  are proposed.

bioinorganic chemistry and applications/bioinorganic chemistry and applications

Syntheses, Spectral Characterization, and Antimicrobial Studies on the Coordination Compounds of Metal Ions with Schiff Base Containing Both Aliphatic and Aromatic Hydrazide Moieties