Two Types of Subgroup-Valence Heteroatoms (P III , Te IV ) Synergistically Controlling Octa-Ce III -Encapsulated Heteropolyoxotungstate and Its Electrochemical Recognition Properties.

Rapid development of the synthetic chemistry of polyoxometalates (POMs) has greatly driven the generation of structurally variable innovative POM-based materials. Herein, we synthesized a novel P III and Te IV synergistically controlling octa-Ce III -encapsulated heteropolyoxotungstate [H 2 N(CH 3 ) 2 ] 11 K 2 Na 6 H 11 [Ce 8 (CH 3 COO) 2 (HP III O 3 ) 2 W 8 O 20 (H 2 O) 12 (B-β-TeW 8 O 30 ) 2 (B-α-TeW 8 O 31 ) 4 ]·64H 2 O ( 1 ). Its distinctive anion skeleton [Ce 8 (CH 3 COO) 2 (HP III O 3 ) 2 W 8 O 20 (H 2 O) 12 (B-β-TeW 8 O 30 ) 2 (B-α-TeW 8 O 31 ) 4 ] 30- is built by two tetra-vacancy [B-β-TeW 8 O 30 ] 8- and four tetra-vacancy [B-α-TeW 8 O 31 ] 10- moieties linked through an inorganic-organic hybrid [Ce 8 (CH 3 COO) 2 (HP III O 3 ) 2 W 8 O 20 (H 2 O) 12 ] 26+ {Ce 8 P 2 W 8 } cluster core. Interestingly, {Ce 8 P 2 W 8 } is assembled from four [W 2 O 11 ] 10- groups and two [HP III O 3 ] 2- anions and eight Ce 3+ ions. Besides, 1 was further composited with carboxylated multiwalled carbon nanotube (CMCN), resulting in a bi-component 1 /CMCN nanocomposite. An electrochemical recognition platform (named as 1 /CMCN/GCE) was built by modifying 1 /CMCN on a glassy carbon electrode (GCE) for electrochemical detection of dopamine (DPA) at physiological pH (pH = 7.0). The findings have shown that 1 /CMCN/GCE exhibits a good detection limit of 4.95 nM for DPA. This work provides considerable inspiration to promote innovative and rational structure designs of POM-based materials and expand their applications to electrochemical and biological detection fields.