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Energy Upconversion Using Platinum(II)-BPI Photosensitizers.

Ellie N Payce1, Dantong Wang2, Jianzhang Zhao2

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|December 10, 2025
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Summary
This summary is machine-generated.

New platinum(II) complexes featuring a diethyl-substituted bis(2-pyridylimino)isoindoline core exhibit phosphorescence and efficient singlet oxygen generation. These complexes show promise as photosensitizers for triplet-triplet annihilation upconversion, reaching up to 29.6% efficiency.

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Area of Science:

  • Organometallic Chemistry
  • Photochemistry
  • Materials Science

Background:

  • Platinum(II) complexes are investigated for their photophysical properties and potential applications in catalysis and optoelectronics.
  • Heteroleptic complexes offer tunable electronic and steric properties through judicious choice of ligands.
  • Bis(2-pyridylimino)isoindoline ligands provide a robust scaffold for coordinating metal centers.

Purpose of the Study:

  • To synthesize and characterize novel heteroleptic platinum(II) complexes with a diethyl-substituted bis(2-pyridylimino)isoindoline (BPIEt) core and varying alkynyl coligands.
  • To investigate the structural, redox, photophysical, and photochemical properties of these complexes.
  • To evaluate their potential as photosensitizers for triplet-triplet annihilation upconversion (TTA-UC).

Main Methods:

  • Synthesis of five Pt(II) complexes with different alkynyl coligands.
  • Full characterization using NMR, IR, UV-vis, luminescence, transient absorption spectroscopies, HRMS, and cyclic voltammetry.
  • X-ray crystallography for structural determination.
  • Density Functional Theory (DFT) calculations.
  • Triplet-triplet annihilation upconversion (TTA-UC) experiments.

Main Results:

  • Structural analysis revealed a deviation from ideal square planar geometry.
  • Redox potentials indicated a Pt(II/III) oxidation and ligand-based reductions.
  • Complexes exhibited phosphorescence in toluene (λem = 625-644 nm) with strong metal-to-ligand charge transfer (MLCT) character.
  • Efficient singlet oxygen generation (up to 73%) was observed.
  • Maximum TTA-UC efficiency of 29.6% was achieved for Pt(BPIEt)(4).

Conclusions:

  • The synthesized Pt(II) complexes are structurally characterized and possess tunable photophysical properties.
  • They are efficient photosensitizers for singlet oxygen generation and TTA-UC.
  • The BPIEt ligand scaffold is suitable for developing advanced platinum-based photofunctional materials.