Synthesis, characterization and spectroscopic study of nickel(II), palladium(II) and platinum(IV) complexes with mixed ligands of (Z)-N'-(furan-3- ylmethylene)isonicotinohydrazide-chloroanilic acid

The new complexes of nickel(II), palladium(II) and platinum(IV) with mixed ligands,L1: (E)-N'-(furan-2-ylmethylene)isonicotinohydrazide and H2L2: 2,5-dichloro-3,6-dihydroxycyclohexa-2,5-diene-1,4-dione were synthesized and characterized by FT-IR, EI-MS, NMR and UV-Visible-NIR spectroscopy. The new complexes were prepared in ethanol solutions and in solid state on the 1:1:1 mole ratio of metal ion to the two ligands, L1 and H2L2, respectively. The physicochemical properties; melting point, magnetic susceptibility and molar conductivity were determined. The effect of pH revealed the stability of complexes in solutions. The IR spectra confirmed the bi dentate chelation of chloroanilic acid and HL1 via two –OH sites and nitrogen immine group and oxygen atom of carbonyl moiety, respectively. The observed data form elemental analyses and spectroscopic measurements investigated the octahedral environment around Pt(VI) ion, whereas the geometry of Ni(II) and Pd(II) approved as square-planner. KEY WORDS: Mixed-ligands of isoniazid, Chloroanilic acid, Spectroscopic properties of (Z)-N'-(furan-3-ylmethylene)isonicotinohydrazide Bull. Chem. Soc. Ethiop. 2025, 39(5), 897-906. DOI: https://dx.doi.org/10.4314/bcse.v39i5.7