Synthesis and structural characterization of copper complexes based on sulfonamides

Abstract

Cu(II)-sulfanilamide and Cu(II)-sulfisoxazole were synthesized with 1:4 ratio of Cu(II) to each ligand. The complexes were characterized by Atomic Absorption Spectroscopy (AAS), UV-vis, Differential Thermal Analysis (DTA) infrared (IR), conductivity, magnetic susceptibility, and powder x-ray diffraction. Electronic spectra of Cu(II)-sulfanilamide and Cu(II)-sulfisoxazole complexes show transition peaks at 793 nm corresponding to the2B1g⃗2 B2g. The value of 10 Dq for Cu(II)-sulfanilamide and Cu(II)-sulfisoxazole is 150.5 kJ/mol. Infrared spectra indicate that sulfanilamide and sulfisoxazole were coordinated through primary amine. Both complexes are paramagnetic and are estimated to have orthorhombic and monoclinic, respectively.