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

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

JOURNAL=Frontiers in Chemistry

VOLUME=8

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.00303

DOI=10.3389/fchem.2020.00303

ISSN=2296-2646

ABSTRACT=<p>Distinct circularly polarized luminescence (CPL) activity was observed in chiral (C<sup>∧</sup>N<sup>∧</sup>N)Pt(II) [(C<sup>∧</sup>N<sup>∧</sup>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<sup>∧</sup>N<sup>∧</sup>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<sup>∧</sup>N<sup>∧</sup>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 (<italic>g</italic><sub>lum</sub>) up to 10<sup>−3</sup>. The distorted structures and enhanced chiroptical signals were further confirmed by time-dependent density functional theory (TD-DFT) calculations.</p>