The novel nickel(II) complex has been successfully synthesized through the reaction of Ni(NO3)2·6H2O with 4-aminoantipyrine (AAP) ligand in a 1:3 mole ratio of Ni(II) to AAP. The complex was characterized using UV-Vis, Atomic Absorption Spectroscopy (AAS), Infrared spectrophotometry (IR), Thermogravimetry/Differential Scanning Calorimetry (TG/DSC), conductivity, and magnetic susceptibility. The complex formula was [Ni(AAP)3](NO3)2·5H2O. AAP was a bidentate ligand that coordinated through the primary amine nitrogen and the carbonyl oxygen to the nickel ion. The electronic spectra of the complex displayed two peaks at 646 nm and 385 nm in accordance with the 3A2g(F) → 3T1g(F) and 3A2g(F) → 3T1g(P) transitions, respectively. This complex gave a paramagnetic property with the effective magnetic moment (µeff) of 2.96 BM and the shape of an octahedron. The antibacterial test of this complex showed higher activity than the metal and its free ligand.

Complex of cobalt(II) with sulfadiazine has been synthesized in a ratio 6: 1 metal to ligand in methanol. The formation of a complex was characterized by a shift in the maximum wavelength (λmax) to the smaller wavelength (527 nm to 515 nm) which shows transitions 4T1g(F) → 4A2g dan 4T1g(F) → 4T1g (P). The percentage of cobalt in the complex measured by Atomic Absorption Spectrometer (AAS) showed the complex formula was Co(Sulfadiazine)3(NO3)2.(H2O)n (n = 2, 3, 4). The conductivity measurement indicated that the complex is 2 to 1 electrolyte. Thermal analysis with Differential Thermal Analyzer (DTA) indicates the presence of H2O in the complex. The formula of the complex was estimated as [Co(Sulfadiazine)3(H2O)3](NO3)2.H2O. The complex was paramagnetic with μeff = 4.59 – 4.97 BM in high spin state. Infrared spectra show a shift in the absorption of primary NH2 functional groups indicating that the functional group was coordinated to the central Co2+ atom monodentically. The geometry of the complex was probably octahedral.

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