Abstract
Two new fluorophenyl-modified cationic cyclometalated Pt(II) complexes have been synthesized. The effects of the fluorophenyl substituents on the properties of the Pt(II) complexes were investigated systematically in comparison with a phenyl-modified complex. The absolute quantum yields of the complexes are significantly increased due to the presence of fluorophenyl groups. All complexes exhibit evident aggregation-induced phosphorescent emission activities in a CH3CN/H2O system. Furthermore, they can effectively detect picric acid (PA) in CH3CN/H2O. Among them, the complex with a 2,4-difluorophenyl group exhibits the lowest limit of detection at 0.09 μM. These complexes exhibit excellent selectivity for detecting PA in complicated environments and work well in real water samples. The luminescence quenching of the complexes is caused by photo-induced electron transfer.
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