Frontiers in Chemistry (Apr 2020)

Enhanced Circularly Polarized Luminescence Activity in Chiral Platinum(II) Complexes With Bis- or Triphenylphosphine Ligands

  • Qian-Ying Yang,
  • Hua-Hong Zhang,
  • Xue-Ling Han,
  • Shi-Dao Weng,
  • Yuan Chen,
  • Jia-Li Wu,
  • Li-Zhi Han,
  • Xiao-Peng Zhang,
  • Zai-Feng Shi

DOI
https://doi.org/10.3389/fchem.2020.00303
Journal volume & issue
Vol. 8

Abstract

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Distinct circularly polarized luminescence (CPL) activity was observed in chiral (C∧N∧N)Pt(II) [(C∧N∧N) = 4,5-pinene-6′-phenyl-2,2′-bipyridine] complexes with bis- or triphenylphosphine ligands. Compared to the pseudo-square-planar geometry of chiral (C∧N∧N)Pt(II) complexes with chloride, phenylacetylene (PPV) and 2,6-dimethylphenyl isocyanide (Dmpi) ligands, the coordination configuration around the Pt(II) nucleus of chiral (C∧N∧N)Pt(II) complexes with bulk phosphine ligands is far more distorted. The geometry is straightforwardly confirmed by X-ray crystallography. The phosphines' participation enhanced the CPL signal of Pt(II) complexes profoundly, with the dissymmetry factor (glum) up to 10−3. The distorted structures and enhanced chiroptical signals were further confirmed by time-dependent density functional theory (TD-DFT) calculations.

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