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New Ligand Design Provides Delocalization and Promotes Strong Absorption throughout the Visible Region in a Ru(II)

Tyler J Whittemore1, Travis A White1, Claudia Turro1

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A new ruthenium complex, Ru-qdpq, exhibits a red-shifted absorption and a long-lived excited state, unlike a related complex. This discovery offers a pathway for developing advanced materials for solar energy and photochemotherapy.

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Area of Science:

  • Coordination Chemistry
  • Photophysics
  • Materials Science

Background:

  • Ruthenium(II) complexes with polypyridyl and quinone-containing ligands are crucial for light-harvesting and energy conversion applications.
  • Understanding excited-state dynamics and electronic communication within these ligands is key to tuning their photophysical properties.

Purpose of the Study:

  • To synthesize and characterize a new Ru(II)-anthraquinone complex, [Ru(bpy)2(qdpq)](PF6)2 (Ru-qdpq).
  • To investigate the photophysical properties, particularly excited-state lifetimes and absorption spectra, of Ru-qdpq in comparison to a related complex, Ru-qdppz.
  • To elucidate the role of ligand coordination modes in dictating electronic communication and excited-state behavior.

Main Methods:

  • Synthesis and characterization of Ru-qdpq and Ru-qdppz complexes.
  • Steady-state absorption spectroscopy to determine absorption maxima and spectral shifts.
  • Ultrafast spectroscopy and time-resolved measurements to analyze excited-state dynamics and lifetimes.
  • Electrochemistry and Density Functional Theory (DFT) calculations to probe electronic structures and properties.

Main Results:

  • Ru-qdpq displays a strong 1MLCT absorption at 546 nm, significantly red-shifted compared to Ru-qdppz (λmax = 450 nm).
  • Ru-qdpq exhibits a long-lived (τ = 19 ns) 3MLCT excited state with delocalized electron density on the qdpq ligand.
  • Ru-qdppz shows shorter-lived excited states (τ = 362 ps) due to electronically isolated states within the ligand.

Conclusions:

  • The unique coordination of qdpq and qdppz ligands leads to distinct electronic communication pathways, influencing excited-state and electron transfer properties.
  • Ru-qdpq's red-shifted absorption and long-lived excited state present a promising platform for developing novel materials.
  • These findings pave the way for designing complexes with tunable photophysical properties for applications in solar energy conversion and photochemotherapy.