Synthesis and characterization complex Cobalt(II) with sulfadiazine

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.