SYNTHESIS AND CHARACTERIZATION OF METAL II COMPLEXES OF MIXED LIGANDS DERIVED FROM ACETAMINOPHEN AND DOPAMINE
Abstract
ABSTRACT
This research focused on the synthesis and characterization of mixed-ligand metal(II) complexes derived from acetaminophen and dopamine using copper(II) chloride and Zinc(II) chloride as metal precursors. The ligands were refluxed and reacted with metal ions under controlled conditions to obtain stable coordination complexes. The resulting products were characterized using physical measurements, solubility analysis, infrared spectroscopy, and UV–Visible spectroscopy. The complexes exhibited characteristic colour changes (dark brown and light green), acceptable percentage yields (91.2%–90%), and higher melting points compared to the free ligands, indicating successful complex formation. Solubility patterns revealed slight solubility in polar solvents and insolubility in non-polar solvents. Infrared spectra showed shifts in functional group vibrations, confirming coordination through oxygen and nitrogen donor atoms. UV–Visible spectroscopy revealed transitions typical of Cu(II) complexes. Overall, the study demonstrates that acetaminophen and Dopamine can effectively coordinate with Cu(II) ions to form stable mixed-ligand complexes.Zn(II) Complex: Shows a strong absorption band in the 210–220 nm range with high absorbance (0.80), assigned to a π → π* transition. This typically arises from conjugated systems or aromatic rings within the ligand, indicating the presence of strong intraligand charge transfer (ILCT) or ligand-centered transitions.
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