Assembly of lanthanide-included arsenomolybdate containing a new [AsMo10O35]7− ligand and its sensitive electrochemical detection of nitrite

IF 5.4 3区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR Inorganic Chemistry Communications Pub Date : 2025-08-01 Epub Date: 2025-04-11 DOI:10.1016/j.inoche.2025.114525

Qiao Gao , Xue-Rui Dong , Ling-Kun Meng , Jing Yang , Zhi-Dong Qiu , Lin Xu

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Abstract

The rational design of electrocatalytic materials based on polyoxometalates is a promising approach for the sensitive electrochemical determination of NO₂⁻. In this study, a novel lanthanide-included arsenomolybdate, formulated as the H₄(NH₄)₂(Him)₁₆[Na(im)]₂[Pr_0.5Na_0.5(H₂O)₃]₂[AsMo₁₀O₃₅]₄·32H₂O (1) (im = imidazole), is obtained through one-pot self-assembly synthesis method. Compound 1 features a ring-shaped framework composed of {AsMo₁₀O₃₅} clusters connected by {Pr_0.5Na_0.5(H₂O)₃} and {Na(im)₂} units. Furthermore, compound 1 is combined with carboxylated multi-walled carbon nanotubes (CMCNT) to form a 1@CMCNT composite, which is modified onto the glassy carbon electrode (GCE) to construct the 1@CMCNT/GCE. Due to the synergistic effect between the excellent redox capacity of compound 1 and the rapid electron transfer rate of CMCNT, the 1@CMCNT/GCE exhibits outstanding performance for NO₂⁻ detection with a sensitivity of 0.5535 μA·μM⁻¹, a detection limit of 0.54 μM (S/N = 3), as well as good selectivity and stability. Moreover, the 1@CMCNT/GCE is employed to detect NO₂⁻ in tap water samples with a desired recovery of 98.30 %-100.24 %. This work provides a new method for the design of a POM-based electrochemical sensing platform for NO₂⁻ detection.

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含[AsMo10O35]7−配体的含镧砷钼酸盐的组装及其对亚硝酸盐的灵敏电化学检测

合理设计基于多金属氧酸盐的电催化材料是一种很有前途的电化学灵敏测定NO2−的方法。本研究采用一锅自组装法合成了一种新型含镧钼酸砷，分子式为H4(NH4)2(Him)16[Na(im)]2[Pr0.5Na0.5(H2O)3]2[AsMo10O35]4·32H2O (1) （im =咪唑）。化合物1具有由{Pr0.5Na0.5(H2O)3}和{Na(im)2}单元连接的{AsMo10O35}簇组成的环状框架。此外，化合物1与羧化多壁碳纳米管（CMCNT）结合形成1@CMCNT复合材料，将其修饰在玻碳电极（GCE）上，构建1@CMCNT/GCE。由于化合物1优异的氧化还原能力与CMCNT快速的电子转移速率之间的协同作用，1@CMCNT/GCE对NO2−的检测性能优异，灵敏度为0.5535 μA·μM−1，检出限为0.54 μM (S/N = 3)，具有良好的选择性和稳定性。此外，1@CMCNT/GCE用于自来水样品中NO2−的检测，期望回收率为98.30% ~ 100.24%。这项工作为设计基于pom的NO2−电化学检测平台提供了一种新的方法。

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来源期刊

Inorganic Chemistry Communications 化学-无机化学与核化学

CiteScore

5.50

自引率

7.90%

发文量

1013

审稿时长

53 days

期刊介绍： Launched in January 1998, Inorganic Chemistry Communications is an international journal dedicated to the rapid publication of short communications in the major areas of inorganic, organometallic and supramolecular chemistry. Topics include synthetic and reaction chemistry, kinetics and mechanisms of reactions, bioinorganic chemistry, photochemistry and the use of metal and organometallic compounds in stoichiometric and catalytic synthesis or organic compounds.