Co (II), Cu (II), Mn (II), Ni (II), Pd (II), and Pt (II) complexes of bidentate Schiff base ligand: Synthesis, crystal structure, and acute toxicity evaluation

5-methoxy-2-(((2chloro-5-(trifluoromethyl)phenyl)imino)methyl)phenol) (HL) and its cobalt (II), copper (II), manganese (II), nickel (II), palladium (II), and platinum (II) complexes, [Co(L)(2)]center dot 4H(2)O (1), [Cu(L)(2)] (2), [Mn(L)(2)(H2O)(2)]center dot H2O (3), [Ni(L)(2)] (4), [Pd(L)(2)] (5), [Pt(L)(2)] (6), were synthesized and characterized. The compounds were investigated by different physico-chemical techniques including IR, H-1-NMR, C-13-NMR, UV-Vis, mass spectroscopies, elemental and thermal analysis, magnetic susceptibility measurements, and molar electric conductivity. The molecular structures of the HL ligand and copper (II), nickel (II), and palladium (II) complexes were confirmed by X-ray crystallography analysis on the monocrystal. Each metal ion, in these complexes, is four-coordinated in N2O2 coordination environment. The coordination geometry of Ni2+ and Pd2+ is square planar due to cystallographically imposed inversion symmetry of the metal centers, and the coordination geometry of copper atom can be described as tetrahedrally distorted square planar. The assessed toxicity of the ligand and its complex combinations on plant cell of Triticum aestivum L. were macroscopically and microscopically consistent. The same substances were investigated for the animal cell toxicity on crustacean Artemia franciscana Kellogg, and Mn2+ complex did not record any lethal effect.

Automated summary

The synthesis and characterization of HL and its cobalt, copper, manganese, nickel, palladium, and platinum complexes were investigated using various physico-chemical techniques. The coordination geometries of Ni2+ and Pd2+ were square planar, while that of copper atom was described as tetrahedrally distorted square planar. Toxicity assessment showed that the Mn2+ complex did not exhibit any lethal effect on animal cells.