Developing new catalysts for highly efficient and selective oxidation of saturated C−H bonds is significant due to their thermodynamic strength. Via incorporation of PW 12 O 40 3− , pyridine-2,5-dicarboxylic acids (pydc), and Fe(III) ions into one framework, a new polyoxometalate-based metal−organic framework, [HFe 4 O 2 (H 2 O) 4 (pydc) 3 PW 12 O 40 ]•10.5H 2 O (FeW−PYDC), was successfully prepared by a hydrothermal method. Interestingly, FeW−PYDC features a three-dimensional porous structure with {Fe 4 O 2 } interconnecting with PW 12 O 40 3− units. FeW−PYDC displayed excellent performance in the selective oxidation of C−H bonds of alkylbenzenes with high conversion (95.7%) and selectivity (96.6%). As an effective heterogeneous catalyst, FeW−PYDC demonstrates good reusability and structural stability.

In the work, by incorporating polyoxometalates (POMs) into a copper(II)-based network, a novel three-dimensional (3D) porous framework, [Cu 17 Cl 3 (trz) 12 ]H 3 [GaW 12 O 40 ]•9H 2 O (Cu-GaW-TRZ), was successfully prepared and explored for the adsorption of dyes. The adsorption capacity of Cu-GaW-TRZ was calculated as 13.11 mg/g, and the dye adsorption rate equaled 96.2% for the adsorption of methylene blue (MB). Furthermore, this recyclable adsorbent is stable enough without obvious loss of adsorption capacity for at least five runs. Meanwhile, the structure of the macropores is suitable for the entry of large molecular dyes, and [GaW 12 O 40 ] 5− also can achieve efficient adsorption for cationic dyes. The results displayed a pseudo-second-order kinetic model and were well matched for MB adsorption onto Cu-GaW-TRZ. The free energy, entropy, and enthalpy of the thermodynamic parameters for the adsorption of MB were calculated, which revealed that the adsorption process was befitting for the adsorption of MB.

We synthesized a high‐nuclear isopolymolybdate cluster (n‐Bu4N)6H2[{Mo24O48(OMe)32}{Mo24O52(OMe)28}2] ⋅ 25H2O ⋅ 6CH3CN (1) by using [Mo6O19]2− as the base precursor. Crystallographic characterization shows the cluster is composed of an anionic [{Mo24O48(OMe)32}]8− cage and two charge‐neutral [{Mo24O52(OMe)28}] cages. Supported by the electrospray ionization mass spectrometry study, the polyoxoanion structural unit [Mo24O48(CH3O)27]3− demonstrates strong stability in acetonitrile solution. Moreover, 1 exhibits good proton conductivity of 1.79×10−3 S cm−1 at 358 K and 98 % relative humidity.

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