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Simon K Brayshaw1, Stephanie Schiffers, Anna J Stevenson

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Area of Science:

  • Organometallic Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Dithienylethene (DTE) derivatives are known photochromic compounds.
  • Tuning DTE properties for enhanced performance, especially in solid-state applications, remains a challenge.

Purpose of the Study:

  • To synthesize and characterize a novel organometallic DTE complex with platinum(II) chromophores.
  • To investigate its photochromic behavior, focusing on efficiency, operational wavelength, and solid-state performance.

Main Methods:

  • Synthesis of the platinum-DTE complex [Pt(PEt(3))(2)(C≡C)(DTE)(C≡C)Pt(PEt(3))(2)Ph] (1).
  • Photophysical characterization using resonance Raman spectroscopy, transient absorption spectroscopy, and X-ray crystallography.
  • Computational analysis using DFT calculations.

Main Results:

  • Complex 1 exhibits highly efficient photochromic ring-closure upon visible light irradiation (>400 nm) with an 80% yield.
  • The heavy atom effect of platinum enables a triplet-sensitized photocyclisation pathway, even for light not absorbed by the DTE core alone.
  • Raman marker bands associated with the alkynyl unit were identified for non-destructive monitoring of photochromic processes.

Conclusions:

  • The novel platinum-DTE complex demonstrates superior photochromic efficiency and thermal stability.
  • The strategy of modifying Pt(II) units offers a pathway to tune absorption properties for visible-light-driven photoswitches.
  • This work paves the way for efficient solid-state photochromic systems and optical readout applications.