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Sulfonamide DPA-Based Mononuclear Cobalt(II) Complexes: Evaluation of ROS-Driven Cytotoxicity.

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|April 30, 2026
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Summary

Four new cobalt(II) complexes were synthesized and studied for their cytotoxic effects on breast cancer cells. Complex 2 showed significant potential as a cobalt-based cytotoxic agent, likely due to reactive oxygen species generation.

Keywords:
DNA cleavageROS productionbreast cancercell cytotoxicitycobalt complexredox propertiessulfonamide‐DPA ligand

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Medicinal Chemistry

Background:

  • Novel mononuclear cobalt(II) complexes offer potential therapeutic applications.
  • Understanding ligand effects on metal complex properties is crucial for developing new agents.
  • Exploring cytotoxic agents against breast cancer cell lines remains a significant research area.

Purpose of the Study:

  • Synthesize and characterize four novel mononuclear cobalt(II) complexes.
  • Investigate the photophysical properties and cytotoxic potential of these complexes.
  • Determine the structure-activity relationship for cobalt-based cytotoxic agents.

Main Methods:

  • Synthesis and characterization of four cobalt(II) complexes using spectroscopic and analytical techniques.
  • Fluorescence studies to analyze photophysical behavior.
  • In vitro cytotoxic assays against human breast cancer cell lines (MDA-MB-231 and MCF-7).

Main Results:

  • Four mononuclear Co(II) complexes, [Co(L1-L4)Cl2] (1-4), were successfully synthesized and characterized.
  • Ligands coordinated bidentately, forming an eight-membered chelate ring.
  • Fluorescence studies showed ligand-dependent quenching or enhancement, indicating varied electronic interactions.
  • Complex 2 exhibited significant cytotoxicity against both MDA-MB-231 and MCF-7 cell lines (IC50 values ~90 µM).
  • Complex 2's activity is attributed to reactive oxygen species (ROS) generation.

Conclusions:

  • The synthesized cobalt(II) complexes display tunable photophysical properties based on ligand structure.
  • Complex 2 demonstrates promising cytotoxic activity against human breast cancer cells.
  • Complex 2 serves as a potential scaffold for developing novel cobalt-based cytotoxic agents.