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Updated: Nov 23, 2025

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
Published on: July 27, 2022
Ring-forming transformation associated with hydrazone changes of hexadecanuclear dysprosium phosphonates
Haiquan Tian1, Fu-Ping Huang2, Yongfei Li1
1Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, P. R. China. tianhaiquan@lcu.edu.cn.
Researchers synthesized novel dysprosium-phosphonate coordination clusters by altering hydrazone ligands. A structural transformation from ellipsoidal to square motifs was observed, leading to similar single-molecule magnet behaviors in the new complexes.
Area of Science:
- Coordination Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Lanthanide coordination clusters are of interest for their magnetic properties.
- Phosphonate and hydrazone ligands offer versatile building blocks for complex structures.
- Controlling the self-assembly of metal-organic frameworks is crucial for designing functional materials.
Purpose of the Study:
- To synthesize and characterize novel dysprosium-phosphonate coordination clusters.
- To investigate the structural impact of varying hydrazone ligands on cluster architecture.
- To explore the magnetic properties, specifically single-molecule magnet behavior, of the synthesized complexes.
Main Methods:
- Multicomponent self-assembly synthesis involving dysprosium salts, 1-naphthylphosphonic acid, and tailored hydrazone ligands.
- Single-crystal X-ray diffraction for detailed structural analysis of the coordination clusters.
- Alternating-current (ac) magnetic susceptibility measurements to probe magnetic properties.
Main Results:
- Two novel Dy-phosphonate coordination clusters, {Dy16(μ6-C10H7PO3)2(μ5-C10H7PO3)8(spch)8(μ3-OH)2(μ2-OH)2(μ2-AcO)6(μ3-COO)2(DMF)2(H2O)6}·0.5CH3OH·4.5H2O (1) and {Dy16(μ5-C10H7PO3)4(μ3-C10H7PO3)12(μ2-C10H7PO3H)8(opch)4(DMF)8(MeOH)4}·2.5CH3OH·3H2O (2), were successfully synthesized.
- A significant structural transformation from an ellipsoidal core to a supramolecular square motif was observed upon incorporating an ortho-methoxy substituent into the hydrazone ligand.
- Both complexes exhibited similar single-molecule magnet behaviors, as indicated by alternating-current magnetic susceptibility studies.
Conclusions:
- The study demonstrates an effective molecular assembly tactic for creating complex lanthanide coordination clusters.
- Varying hydrazone ligands provides a pathway to control the structural architecture and properties of Dy-phosphonate systems.
- The observed structural transformation highlights the importance of ligand design in supramolecular assembly and the development of single-molecule magnets.
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