New Metal Complexes of 2-(3-(4-Nitrobenzoyl)Thioureido)Benzoic Acid, Synthesis and Characterization (NTB)

The presence of a drive site within ligand structures plays a crucial role in enhancing their interaction with metal ions, resulting in highly efficient complex formation research. A new ligand, 2-(3-(4-nitrobenzoyl) thioureido) benzoic acid (NTB), was successfully synthesized via the reaction of 4-nitrobenzoyl isothiocyanate with anthranilic acid in a 1:1 molar ratio. The structure of the ligand was confirmed using elemental analysis, FT-IR, UV-Vis., and ¹H and ¹³C NMR spectroscopy. Then a series of metal complexes was synthesized by reacting NTB with divalent metal ions, including Hg²⁺, Cd²⁺, Zn²⁺, Cu²⁺, Ni²⁺, Co²⁺, and Mn2+. The analytical results suggest that all metal complexes adopt a tetrahedral geometry, except for the copper complex, which exhibits a square planar structure. The metal-to-ligand ratio in all complexes was determined to be 1:2, supporting the proposed [M(NTB)₂] formulation.