Inorganic Chemistry· 2026Q1
Pyrazinephosphonate-Bridged Dysprosium(III) Cyclic Coordination Clusters
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- 2026year
Short summary
Researchers synthesized three giant hollow hexagonal dysprosium(III) coordination clusters (Dy6, Dy24a, Dy24b) with high metal center density, demonstrating precise control over size and shape for advanced magnetic materials.
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Key points
- Synthesized three giant hollow hexagonal dysprosium(III) coordination clusters: Dy6, Dy24a, and Dy24b.
- Achieved high metal center density through the assembly of pyrazinephosphonate and hydrazone ligands in large cavities.
- Demonstrated precise tuning of cluster size and shape by modifying ligand structures.
- Observed that structural changes, like pyridyl to pyrazinyl group replacement, impact single-molecule magnet behavior.
AI-generated from the title and abstract; the full text is not read.
Abstract
Abstract Noncentered paramagnetic metal rings are widely regarded as ideal prototypes for exploring one-dimensional magnetic systems. Herein, we report the synthesis of three giant hollow hexagons, Dy6, Dy24a, and Dy24b. Dy6 hexagon is assembled from a single pyrazinyl hydrazone ligand, without ring-expanding agents. The coalescence of the pyrazinephosphonate and C2-symmetric di-o-vanilloyl hydrazones enables access to two hexagonal nuts, Dy24a and Dy24b, with large cavities, in which six hydrazone ligands capture 18 DyIII ions to construct the outer hexagons, while the pyrazinephosphonate ring-expanding agents fix the inner hexagons, enabling high metal center density. Replacing the key pyridyl group of the hydrazone ligand with a pyrazinyl group transforms Dy24a into Dy24b. The structural changes substantially influence the zero-field single-molecule magnet behavior. This work demonstrates the feasibility of building giant noncentered paramagnetic metal rings and precisely tuning their size and shape, thereby paving new avenues for the design and synthesis of advanced materials.
The authors' abstract, as published at the source. Inorganic Chemistry, 2026 · DOI ↗
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Field: Electronic, Optical and Magnetic Materials
Electronic, Optical and Magnetic MaterialsMaterials Science