コアに含まれる多価ランタニドを含むリン(III)タングステン酸塩とMIL-(53)Feから構築されたコアシェルヘテロ構造複合材料をナノ酵素として使用した3,3

The development of novel multicomponent nanozymes with high catalytic efficiency and selectivity continues to be a focal point in contemporary research. In this work, a multilanthanide-containing phospho(III)tungstate [H₂N(CH₃)₂]₈Na₁₂H₁₆[La₄(H₂O)₁₅W₈(tart)₃(H₂tart)O₂₀]₂[H₂P₂W₁₄O₅₂]₄·52H₂O (1, H₄tart = tartaric acid) was synthesized. Its polyoxoanion consists of two identical tartrate-stabilized tetra-La³⁺-substituted {La₄(H₂O)₁₅W₈(tart)₃(H₂tart)O₂₀} units bridged by four multivacant Dawson-like [H₂P₂W₁₄O₅₂]^12- fragments. Subsequently, 1 was subjected to ultrasonic treatment to form a nanofilm, which was then used as a guest material to coat MIL-(53)Fe (MILFe), preparing a series of core-shell heterostructured MILFe@1 composites. These MILFe@1 composites facilitate multielectron transfer and function as highly active nanozymes, significantly enhancing the catalytic oxidation of 3,3',5,5'-tetramethylbenzidine (TMB). Under optimized conditions, the MILFe@1-2 (1: MILFe = 1:2) composite demonstrates robust catalytic performance over a broad TMB concentration range without the need for H₂O₂. This work highlights the potential of integrating lanthanide-containing polyoxometalates with metal-organic frameworks to construct core-shell heterostructured nanozymes with enhanced catalytic efficiency. Concurrently, the polyoxometalate shell enables rapid electron transfer kinetics, which is crucial for enhancing the overall catalytic performance of the system.