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Area of Science:

  • Coordination Chemistry
  • Medicinal Inorganic Chemistry
  • Computational Chemistry

Background:

  • Schiff bases derived from pyrazolone ligands are versatile building blocks in coordination chemistry.
  • Zinc(II) complexes are explored for their potential biological activities, including anticancer properties.
  • Mutant p53 proteins are frequently implicated in cancer development and progression.

Purpose of the Study:

  • To synthesize and characterize novel Schiff base pyrazolone ligands and their zinc(II) complexes.
  • To investigate the structural, computational, and photophysical properties of these metal complexes.
  • To evaluate the in vitro anticancer activity of the zinc(II) complexes against cancer cell lines expressing specific mutant p53 proteins.

Main Methods:

  • Synthesis and characterization of nine Schiff base ligands (HL) and their zinc(II) complexes ([Zn(L)2]).
  • Single-crystal X-ray diffraction for structural determination of selected complexes.
  • Density Functional Theory (DFT) studies, powder X-ray diffraction, and photophysical measurements.
  • In vitro cytotoxicity assays and assessment of mutant p53 protein levels in human cancer cell lines.

Main Results:

  • Nine Schiff base pyrazolone ligands and their corresponding zinc(II) complexes were successfully synthesized.
  • X-ray diffraction revealed a distorted tetrahedral geometry around the Zn(II) ion in the studied complexes.
  • DFT studies elucidated electronic properties, and experimental data supported a dissociation-hydrolysis mechanism for the ligands.
  • Significant cytotoxic activity and reduction in mutant p53 protein levels were observed for complexes exhibiting higher Zn(II) ion release.

Conclusions:

  • The synthesized zinc(II) complexes possess potential as anticancer agents.
  • The observed anticancer efficacy is linked to the release of Zn(II) ions and subsequent reduction of mutant p53.
  • These findings highlight the importance of ligand dissociation and metal ion bioavailability in the mechanism of action.