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The present report is concerned with the synthesis novel Schiff base ligand by condense 6-Amino Penicillinic acid with Salicyldehyde. The ligand was characterized by 1 H-NMR, 13 C-NMR, mass spectrometry, UV-Vis and FT-IR studies. The ligand have got more than one moiety which are capable of chelation, therefore complexes of Co(II), Ni(II), Cu(II), and Zn(II) were prepared. These complexes were characterized by UV-Vis, FT-IR, magnetic susceptibility and Molar conductivity studies. All these techniques indicate 1:2 stoichiometry of synthesized complexes. In all the complexes, Schiff base ligand acts as a tridentate ligand. Finally, the ligand and complexes have been screened for their antibacterial activity against four types of bacteria (Staphylococcus aureus, Pseudomonas aeruginosa, Streptococcus facials and Proteus mirabilis) then it isolated from different classes of ulcerative infections while L showed to be tridentate ligand with single negative charge through three active groups, L has been associated with metal ions to form the claw complexes to get octahedral shape. The prepared ligand and its complexes illustrated a good inhibitory ability towards the three varieties bacteria (Staphylococcus aureus, Pseudomonas aeruginosa, and Proteus mirabilis), while the four complexes failed to be suggested in treatment of ulcers that caused by Streptococcus facials. So, the prepared compounds could be good alternatives to the common drugs which are used in treatment of ulcers.

The reaction of 6-amino pencillanic acid with Schiff base "(Z)-3-((3-hydroxybenzylidene) amino) phenol)" has formed a novel Azo-azomethine ligand (HL) "( 7-((Z)-(2-hydroxy-4-((Z)-((3-hydroxyphenyl) imino) methyl) phenyl) diazenyl)-3, 3dimethyl-6-oxo-2-thiabicyclo [3.2.0] heptane-4-carboxylic acid". The ligand (HL) is characterized by 1 H-NMR, 13 C-NMR, Mass Spectrometry, CHNs, Uv-Visible, and FT-IR. This new Ligand (HL) is used to prepare numerous complexes using transition metal ions Fe (II) Cu (II), and Ni (II). These complexes' properties are studied using different techniques such as Mass Spectroscopy, Atomic Absorption, FT-IR, UV-Visible, Magnetic Moment, and Molars Conductivity. All these techniques indicate 1:2 (M: L) stoichiometry's synthesized complexes. Azo-azomethine ligand (HL) acts as a tridentate ligand to form the octahedral shape complexes with sp 3 d 2 , d 2 sp 3 hybridization. These new ligands and complexes are studied for their biological activity. The results show that the minimum inhibition concentration (MIC) of the prepared compounds has inhibition activity against Staphylococcus aureus bacteria and obviously affects the ability of pathogenic bacteria (S. aureus) to attain virulence factors such as Biofilm and hemolysin toxin

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In this study, a novel azo-azomethine ligand [6[2-hydroxy-4-((3-nitrophenyl)diazenyl)-1-phenyl]imine penicillanic acid] [HNDIP] is synthesized from [2-hydroxy-4-((3-nitrophenyl)diazenyl) benzaldehyde]. And reflux with 6-aminopenicillin acid, this ligand was identified by UV-Vis, FTIR, 1H-NMR, C13NMR, and mass, and it was used to prepare new complexes with [Cu(II), Ni(II), Co(II), Zn(II), and Fe(II)] metal ions. These complexes were identified by FTIR, UV-Vis, molar conduct, magnetic sensitivity, and atomic absorption for all complexes, the reaction ingredients were observed to be ratio 1:2 (metal: ligand). The ligand, a tridentate with a single negative charge, was coupled with metal ions to form claw complexes, resulting in an octahedral shape. Finally, antibacterial effectiveness was determined for the ligand and complexes against two distinct bacteria strains (Pseudomonas and klebsiella). It was discovered that the ligand and its complexes have high inhibitory activity against bacteria (Pseudomonas and Klebsiella). As a result, the chemicals created may be feasible substitutes for routinely used drugs.