Synthesis, characterization of superparamagnetite nanoparticles functionalized with aminothiophene and salicylaldehyde derivative schiff base metal complexes and application to synthetic waters for copper removal

In the first step of this study, the compound (2-amino-6-ethyl-4,5,6,7-tetrahydrothieno[2,3-c]pyridine-3-carbonitrile) (I), which is an amino thiophene derivative, was obtained according to the literature method. In the second step, in another study, (2-((3,5-dichloro-2-hydroxybenzylidene)amino)-6-ethyl-4,5,6,7-tetrahydrothieno[2,3-c]pyridine-3-carbonitrile) Schiff base (L) ligand was first synthesized as a result of the condensation reaction of a salicylaldehyde derivative "3,5-dichloro-2-hydroxybenzaldehyde" compound and the amino thiophene derivative (I) compound. After obtaining Schiff base (L) ligand, the original Fe(II) and Co(II) complexes were synthesized. The structures of aminothiophene (I) compound and Schiff base (L) ligand were characterized by FT-IR, 1H-NMR, 13C-NMR and elemental analysis methods. The structures of the complexes were elucidated with the help of spectroscopic methods such as FT-IR, UV-visible region and LC-MS mass analysis, as well as TGA-DTA analysis, magnetic susceptibility and elemental analysis. It was determined that both complexes formed as a result of the Schiff base acting as a bidentate ligand had octahedral geometry and paramagnetic properties. In the last step, the synthesis and characterization of nanoparticles doped with Fe(II) and Co(II) complexes were performed and their effects on copper removal in synthetic waters were examined.