Salicyaldehyde and their derivatives can be condensed with amines in 1:1 and 2:1 ratio to form bi, tri and tetra dentate NO and
N2O2 Schiff base Ligands. They can contain additional donor atoms like oxygen, sulphur, nitrogen etc. which makes them Suitable
chelating ligands to coordinate with Metal ions to form Schiff base complexes. Thus provides the possibility synthesis of
large number of Schiff base complexes with divers’ structural feature. The model system including those with bidentate, tridentate
and tetra dentate Schiff base derived from Salicyaldehyde and their coordination chemistry are summarized in this review.

Metal complexes of schiff base derived from salicylaldehyde – a review -

Co(II), Ni(II), and Cu(II) complexes of aroylhydrazone mixed with aspirin were synthesized and characterized by percentage metal analysis, infrared and electronic spectroscopy, melting point, solubility, molar conductance and room temperature magnetic moment measurements. Infrared spectra data revealed that the aspirin behaved as a bidentate ligand with coordination via carboxylate and carbonyl groups while the hydrazine coordinated via the azomethine nitrogen atom and carbonyl oxygen atom in the aroylhydrazone. The room temperature magnetic moment and electronic spectral data that the metal complexes possessed octahedral geometry. The molar conductance measurements of all the metal complexes in DMF indicated that they are non-electrolytes. The in vitro antimicrobial activities studies showed that the Cu(II) complex had the best activity against tested bacteria; Streptococcus spp, B. subtlis and vibro spp with inhibitory zones range of 2.0 - 6.0 mm, while the Ni(II) complex showed considerable activity against gram negative bacteria; Shigella spp with inhibitory zone of 10.0 mm suggesting its potential as an antimicrobial agent.

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Synthesis, Characterization and Antimicrobial Activities of Cobalt(II), Nickel(II) and Copper(II) Complexes of Aroylhydrazone Mixed with Aspirin

Two novel aroylhydrazonemonoxime ligands and their metal (II) complexes of [Co II ,Ni II ,Cu II ,Zn II ,Cd II ] were synthesized. These ligands are Diacetylmonoxime-4nitrobenzoylhydrazone (L1H2), Diacetylmonoxime-4-hydroxybenzoylhydrazone (L2H2). The synthesized 4-hydroxybenzoyl hydrazide and 4-nitrobenzoylhydrazide were reacted with diacetyl monoxime to obtain the (L1H2, L2H2) ligands. Mononuclear complexes of these ligands of the type [M(LnH)2] where (M- = Co II ,Ni II ,Cu II ,Zn II ,Cd II ; n =1,2) with metal:ligand molar ratio of (1:2) were prepared in the presence of Et3N . The metal ions complexes [M(LnH)2] are proposed to be six-coordinated with a N4O2 donor environment. Each ligand is coordinated through the oxime nitrogen, the imine nitrogen and the enolic oxygen atoms while the phenolic hydroxyl and oxime hydroxyl groups of aroylhydrazonemonoxime moiety do not participate in coordination. The structures of the complexes were suggested on the basis of 1 H-NMR, 13 C-NMR, FT-IR, elemental analysis (CHN), magnetic susceptibility measurements and U.V.–visible spectroscopy.

/pdf/synthesis-and-characterization-of-co-ii-ni-ii-cu-ii-zn-ii-211bepa7fh.pdf

Salim J. Mohammed سام جاسم محمد

Papers

Synthesis and Characterization of Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) Complexes with Aroylhydrazonemonoximes