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A new strategy for the determination of Cu(II) ions was developed using K 10 H 3 [Eu(SiMo 6 W 5 O 39 ) 2 ]·28H 2 O. The polyoxometalate H 4 SiMo 6 W 6 O 40  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 Eu 3+  was quenched due to the inner filter effect (IFE) of Cu(II) to K 10 H 3 [Eu(SiMo 6 W 5 O 39 ) 2 ]·28H 2 O and the static burst. Therefore, K 10 H 3 [Eu(SiMo 6 W 5 O 39 ) 2 ]·28H 2 O can be used as a specific fluorescent probe for Cu 2+  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%.

A novel fluorescent probe for copper (II) ion based on rare earth polyoxometalate