Abstract
The phosphorescence properties of platinum(II) complexes bearing a fluorine-substituted tridentate ligand were investigated to understand their counterintuitive weak emission. The n-tetrabutylammonium salt, (n-Bu4N)[Pt(dFphpy)X] (H2dFphpy = 2,6-bis(2,4-difluorophenyl)pyridine, X = CN− (1), Cl− (2)) exhibited weak structureless solid state emission spectra at 77 and 298 K. Based on temperature-dependent emission lifetime analysis and computational studies, the emissive states of 1 and 2 were assigned to the metal-to-ligand charge transfer state (3MLCT). The small activation energies from the emissive state with a planar structure to a non-emissive excited state with a bent structure resulted in low emission efficiency even in the solid state.
Published Version
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