The 2,4-diarylquinoline-based Platinum(II) complexes: Synthesis, photophysical and electrochemical properties, and application in detection of hypochlorite

Abstract

A series of 2,4-diarylquinoline-based new Pt(II) complexes were synthesized. The effects of the substituents on the photophysical and electrochemical properties were investigated. All complexes display an emission band with a wavelength of longer than 600 nm (600‒617 nm in solution state). The data show that the incorporation of an aryl group at the 4-position of quinoline core results in a significant red shift of emission bands of over 20 nm in comparison with the analogue complexes without a 4-aryl ring in the ligands. In addition, the photophysical and electrochemical properties of the complexes are also influenced by the position and electronic nature of the substituents in the 2,4-aryl rings. Finally, a preliminary investigation demonstrates that the new complexes can serve as potential luminescence chemosensors for highly selective and sensitive monitoring ClO- species with a limit of detection (LOD) up to 45.7 nM.