Circularly polarized luminescence (CPL) activity switched by PtPt interaction is disclosed in two couples of dinuclear Pt(ii) complex enantiomers. Upon varying the length of the bridging ligand, intramolecular metal-metal interaction manipulation is achieved as evidenced from crystal structures. Complex (-)-1 exhibiting strong PtPt interaction displays red phosphorescence with a maximum peak at 638 nm, while complex (-)-2 exhibiting weak PtPt interaction displays green phosphorescence with a maximum peak at 530 nm. The observed CPL was opposite in sign for the two complexes. TD-DFT simulations further confirmed the influence of the PtPt distance on the difference in the electronic optical activities.
The structure-mechanoluminescence relationship is explored in respect of packing patterns and corresponding intermolecular interactions that is affected by the number and location of -F. The distinct and reversible mechanochormic luminescence...
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 (g lum) 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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