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An octanuclear 3-phenyl-5-(2-pyridyl)pyrazolate/phenylsilsesquioxane complex: synthesis, unique structure, and catalytic activity.
Dalton Trans
December 2024
Shandong University, Department of Chemistry and Chemical Engineering, Shanda South Road 27, 250100 Jinan, China.
The first metallasilsesquioxane bearing pyrazolylpyridine ligands, the Cu-based complex 1, adopts a cage-like structure with two zigzag-type copper tetramers sandwiched by two cyclic Si silsesquioxane ligands. The four 3-phenyl-5-(2-pyridyl)pyrazolate ligands in 1 exhibit dual (chelating and bridging) modes of ligation. Compound 1 is very active in the oxidation of alkanes and alcohols.
View Article and Find Full Text PDFSolvent-dependent Ln(III) clusters assembled by immobilization of CO in air: zero-field single-molecule magnets and magnetic refrigerant materials.
Dalton Trans
December 2024
School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China.
Article Synopsis
- The automatic fixation of CO in air is crucial for creating Dy(III) and Gd(III) molecular magnets and refrigeration materials using a specific hydrazone Schiff base ligand.
- The choice of solvent, methanol vs. ethanol, significantly alters the final structures of the resulting Ln(III) cluster complexes, leading to the formation of distinct geometries, such as trapezoidal and triangular clusters.
- Investigations into the magnetic properties show that some clusters exhibit zero-field single-molecule magnet behavior, while others display significant magnetocaloric effects, indicating their potential applications in magnetic cooling technologies.
Octanuclear Zinc Clusters in Microporous Organic Polymers: Network-Enhanced Reductive CO Fixation to Formamides at Room Temperature.
Small
November 2024
Department of Chemistry, Sungkyunkwan University, Suwon, 16419, South Korea.
A building block containing eight zincs and eight iodo groups (8 Zn) is obtained by the Zn complexation of a salen ligand bearing two additional hydroxy groups. Through the Sonogashira-Hagihara coupling of 8 Zn with 1,3,5,7-tetra(4-ethynylphenyl) adamantane, microporous organic polymers bearing octanuclear zinc clusters (MOP-8 Zn) are prepared, exhibiting a high surface area of 562 m g, microporosity, and a particulate morphology with an average diameter of 249 nm. The MOP-8 Zn exhibits significantly enhanced catalytic performance, compared to molecular counterparts, in the reductive carbon dioxide fixation to formamides, possibly due to the cooperative adsorption and confinement effect of networks on substrates.
View Article and Find Full Text PDFProton-Induced Reversible Spin-State Switching in Octanuclear Fe Spin-Crossover Metal-Organic Cages.
J Am Chem Soc
August 2024
Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, P. R. China.
Responsive spin-crossover (SCO) metal-organic cages (MOCs) are emerging dynamic platforms with potential for advanced applications in magnetic sensing and molecular switching. Among these, Fe-based MOCs are particularly noteworthy for their air stability, yet they remain largely unexplored. Herein, we report the synthesis of two novel Fe MOCs using a bis-bidentate ligand approach, which exhibit SCO activity above room temperature.
View Article and Find Full Text PDFConstruction of a redox-active metal-organic framework with an octanuclear lithium one-dimensional building block.
Chem Commun (Camb)
July 2024
School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, China.
A stable lithium metal-organic framework, constructed using a redox-active ,,','-tetrakis(4-carboxyphenyl)-1,4-phenylenediamine linker and Li cluster-based one-dimensional rod secondary building unit, exhibits good stability and reversible redox activity. The Li-MOF, which can be oxidized by AgNO, has the potential to function as an electrochromic device, thereby advancing the development of smart MOF materials.
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