New Materials, Compounds and Applications

The aim of this study was to synthesize new complexes and evaluate their activity against some bacterial strains. Ciprofloxacin was used as a positive antibacterial control. Complexes were synthesized by the interaction of dipotassium tartrate (Tar) and 4-aminoantipyrine (4-AAP) ligands as mixed ligands with metal chlorides in ethanol media in a molar ratio of L¹:M:L² (1:1:1). FT-IR spectral data revealed shifts in the ν(C=O), ν(N-H) and ν(COO⁻) carboxylic bands, confirming that the ligands coordinate to the metal ion center through both the carbonyl oxygen and amine nitrogen atoms for 4-AAP and dicarboxylic groups for (Tar), acting as bidentate donors. Additionally, water was found to participate in coordination, completing the metal's coordination sphere. The general formula of the synthesized compounds was K[M(Tar)(4-AAP)(H₂O)Cl], where M = Mn(II), Co(II), Ni(II), Cu(II) and Zn(II). The complexes were characterized by FTIR, ¹H NMR, ¹³C NMR spectroscopy, magnetic susceptibility, atomic absorption and molar conductivity. The geometric shape of the complexes is consistent with the octahedral shape. Calculations for this study were carried out using the Gaussian 09 program package coupled with the DFT technique to optimize different complexes with the B3LYP/LANL2DZ basis set and quantum chemical calculations of various quantum chemical descriptors were calculated using density functional theory (DFT).