Abstract

A new strategy for the determination of Cu(II) ions was developed using K₁₀H₃[Eu(SiMo₆W₅O₃₉)₂]·28H₂O. The polyoxometalate H₄SiMo₆W₆O₄₀ acts as a ligand to sensitize the europium ion to emit red fluorescence, and the fluorescence was quenched by the addition of Cu(II) ions. The luminescence of the central Eu³⁺ was quenched due to the inner filter effect (IFE) of Cu(II) to K₁₀H₃[Eu(SiMo₆W₅O₃₉)₂]·28H₂O and the static burst. Therefore, K₁₀H₃[Eu(SiMo₆W₅O₃₉)₂]·28H₂O can be used as a specific fluorescent probe for Cu²⁺ and it exhibited a very good linear response range for copper ions from 1 to 20 μM with detection limit of 0.13 µM. The probe was successfully applied to the determination of Cu(II) ions in clam samples with recoveries in the range of 90–98%.

摘要

_{使用 K 10} H ₃ [Eu(SiMo ₆ W ₅ O ₃₉ ) ₂ ]·28H ₂ O开发了一种测定 Cu(II) 离子的新策略。多金属氧酸盐 H ₄ SiMo ₆ W ₆ O ₄₀作为配体敏化铕离子发出红色荧光，并通过添加 Cu(II) 离子淬灭荧光。_{由于 Cu(II) 对 K 10} H ₃ [Eu(SiMo ₆ W ₅ O ₃₉ )的内过滤效应 (IFE)，中心 Eu ³⁺的发光被淬灭₂ ]·28H ₂ O 和静电爆裂。因此，K ₁₀ H ₃ [Eu(SiMo ₆ W ₅ O ₃₉ ) ₂ ]·28H ₂ O可作为Cu ²⁺的特异性荧光探针，对1~20的铜离子表现出很好的线性响应范围。 μM，检测限为 0.13 μM。该探针成功应用于蛤样品中Cu(II)离子的测定，回收率在90-98%范围内。