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New platinum(II) complexes with phenylazopyridine ligands show tunable photoactivity. The diazido complexes are photoactive, with potential for targeted cancer therapy via UVA light activation and nuclear uptake.

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Area of Science:

  • Inorganic Chemistry
  • Photochemistry
  • Materials Science

Background:

  • Platinum(II) complexes are investigated for their photophysical and biological properties.
  • The phenylazopyridine (Ph-azpy) ligand offers tunable electronic properties through phenyl ring substitution.
  • Monodentate ligands (Cl, N3) and substituents on the Ph-azpy ligand influence complex behavior.

Purpose of the Study:

  • Synthesize and characterize novel platinum(II) complexes with Ph-azpy ligands.
  • Investigate the impact of ligand substitution and monodentate ligands on spectral and photoactivation properties.
  • Evaluate the potential of these complexes in biological applications, particularly photodynamic therapy.

Main Methods:

  • Synthesis and characterization of platinum(II) complexes [Pt(p-R-Ph-azpy)X2].
  • Time-dependent density functional theory (TD-DFT) calculations for electronic structure analysis.
  • UV-visible absorption spectroscopy to study electronic transitions.
  • Photolysis studies in solution under UVA and visible light irradiation.
  • Preliminary biological screening, including cellular uptake and cytotoxicity assays.

Main Results:

  • Complexes exhibit low-lying unoccupied orbitals with σ-antibonding character.
  • Absorption bands are assigned to ligand-centered or metal-to-ligand charge-transfer transitions.
  • Substituents (NMe2, OH/O-) on the Ph-azpy ligand cause a redshift in absorption spectra.
  • Diazido complexes show photoactivity, with varying light sensitivity based on substituents.
  • The phenolato complex demonstrates rapid nuclear uptake in HaCaT keratinocytes and increased cytotoxicity upon UVA irradiation.

Conclusions:

  • Electronic properties and photoactivity of platinum(II)-Ph-azpy complexes are tunable via ligand design.
  • Diazido complexes are promising photoactive agents, especially the phenolato derivative.
  • The phenolato complex exhibits efficient nuclear targeting and photo-enhanced cytotoxicity, suggesting potential in photodynamic cancer therapy.