Tetraphenylethene-based platinum (II) complex with aggregation- induced electrochemiluminescence for the detection of glutathione

作者：He, Linli; Wang, Yu; Wang, Yujie; Niu, Yibo; Li, Nan^*; Ye, Jianshan^*; Ma, Ying^*

来源：Electrochimica Acta, 2024, 475: 143596.

DOI：10.1016/j.electacta.2023.143596

• Aggregation-induced electrochemiluminescence
• TPPE
• Pt (II) complex
• Glutathione sensor
• Catalytic

Aggregation-induced electrochemiluminescence (AIECL) has been attracting great interests in ECL study, while it is still a big challenge to develop AIECL fluorophores with high emission efficiency and fair excitation potential. Herein, we develop a new ECL reagent platinum (II)-1,1,2,2-tetrakis(4-(pyridin-4-yl) phenyl) ethylene (Pt-TPPE) self-assembled via the coordination of pyridine group of TPPE and the metal cation of Pt (II). The resulting PtTPPE demonstrates excellent ECL emission properties in terms of high ECL emission efficiency and significant shift of ECL excitation potential from -1.6 V to -1.3 V. The corresponding ECL emission mechanism indicates that the formation of Pt-TPPE greatly limits the movement of TPPE ligand to reduce the non-radiated emission, and the catalytic decomposition of co-reactant K2S2O8 into SO4 center dot- by Pt (II) cation is responsible for the shift of the excitation potential. The competitive coordination of thiol group with the Pt(II) cation effectively dissociate the Pt-TPPE complex, resulting in the quenching of its ECL emission, enabling the sensitive determination of thiolcarrying compound glutathione (GSH) with a low limit of detection (LOD = 0.298 mu M) and wide linear range (1 mu M-1 mM).

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