Preparation, spectroscopic study of Schiff base derived from dopamine and metal Ni(II), Pd(II), and Pt(IV) complexes, and activity determination as antioxidants
May J. Kareem, Abbas Ali Salih Al‐Hamdani, Vian Yamin Jirjees, Mohammad Ehtisham Khan, A.W. Allaf, Wail Al Zoubi
Abstract
Abstract A new Schiff base (HL 2 ) ligand (4‐{2‐[(2‐hydroxy‐benzylidene)‐amino]‐ethyl}‐benzene‐1,2‐diol) has been synthesized by condensing of 4‐(2‐amino‐ethyl)‐benzene‐1,2‐diol and 2‐hydroxy‐benzaldehyde. In turn, its transition metal complexes were prepared, having the following general formulas: Ni(L 2 ) 2 , Pd(L 2 ) 2 , and Pt(L 2 ) 2 2Cl. The prepared ligand and its metal complexes Ni(II), Pd(II), and Pt(IV) have been characterized by Fourier transform infrared (FTIR) spectra, proton nuclear magnetic resonance ( 1 H‐NMR) elemental analysis, metal content, chloride content, molar conductance, ultraviolet–visible (UV–Vis) spectra, magnetic susceptibility, mass spectrometry (MS) spectra, and thermogravimetric analysis (TGA). The consequences proposed that Schiff base acts like a bidentate ligand for all the prepared complexes. The antioxidant performance of as‐prepared compounds was inspected using the DPPH radical scavenging method. The compounds showed antioxidant activities of scavenging free radicals.