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Joy E Rogers1, Jonathan E Slagle, Douglas M Krein

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This study investigates platinum acetylide complexes for their photophysical properties. These molecules show strong two-photon absorption and efficient intersystem crossing to long-lived triplet states, useful for advanced optical applications.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Organometallic Chemistry

Background:

  • Platinum acetylide complexes are explored for their unique photophysical properties.
  • Two-photon absorption (TPA) and intersystem crossing (ISC) are crucial for advanced optical materials.

Purpose of the Study:

  • To synthesize and characterize platinum acetylide chromophores with strong TPA cross-sections.
  • To investigate the photophysical pathways, including TPA and ISC, in these novel platinum complexes.

Main Methods:

  • Synthesis of platinum acetylide complexes with functionalized ligands.
  • Spectroscopic characterization including ultrafast transient absorption and emission.
  • Femtosecond and nanosecond transient absorption spectroscopy to probe excited-state dynamics.

Main Results:

  • Synthesized four platinum acetylide complexes (1-4) with varying conjugated ligands.
  • Observed strong two-photon absorption in the visible and near-infrared regions (600-800 nm).
  • Demonstrated rapid intersystem crossing (k_ISC ~ 10^11 s^-1) to long-lived triplet states (tau > 100 μs) with strong absorption.

Conclusions:

  • Platinum acetylide complexes exhibit efficient two-photon absorption and efficient generation of long-lived triplet states.
  • The photophysical behavior is consistent with a gerade-gerade transition for TPA and ligand-localized triplet states.
  • These findings highlight the potential of these platinum complexes in applications requiring efficient light harvesting and energy transfer.