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Magneto-Structural Correlations in Coordination Polymers Based on Formate Ligand and Transition Metal Cations.
Francisco Rubio-Sepúlveda1,2,3, Alicia Manjón-Sanz4, Laura Cañadillas-Delgado5
1Facultad de Química y Biología, Departamento de Química de los Materiales, Universidad de Santiago de Chile, Santiago 9170022, Chile.
Inorganic Chemistry
|April 10, 2025
Summary
Five new coordination polymers (CPs) exhibit antiferromagnetic interactions and magnetic long-range order. Neutron diffraction confirmed antiferromagnetic ordering and spin canting in these formate-based materials.
Area of Science:
- Materials Science
- Solid State Chemistry
- Magnetism
Background:
- Coordination polymers (CPs) are versatile materials with tunable properties.
- Formate ligands offer unique structural and magnetic characteristics in CPs.
- Understanding magnetic interactions in CPs is crucial for developing advanced materials.
Purpose of the Study:
- To synthesize and characterize five new three-dimensional (3D) coordination polymers (CPs) using formate ligands.
- To investigate the crystal structures, including novel nuclear structures and space groups.
- To explore the magnetic properties, magnetic long-range order (LRO), and magnetic exchange pathways.
Main Methods:
- Synthesis of five 3D coordination polymers with general formulas [NaM(HCOO)3(H2O)] and [KM(HCOO)3].
- X-ray diffraction for structural elucidation, including determination of space groups and nuclear structures.
- Magnetic measurements (susceptibility, heat capacity) to probe magnetic interactions and LRO.
- Neutron diffraction (single-crystal and powder) to determine the magnetic structure and confirm ordering.
Main Results:
- Successful synthesis of five formate-based CPs: [NaCo(HCOO)3(H2O)], [NaNi(HCOO)3(H2O)], [KMn(HCOO)3], [KCo(HCOO)3], and [KNi(HCOO)3].
- Discovery of three new nuclear structures with P21 and P6322 Sohncke space groups, including a chiral structure.
- Predominance of antiferromagnetic interactions (zJ/kB from -1.18 to -94.9 K) and observation of magnetic LRO at low temperatures.
- Neutron diffraction confirmed antiferromagnetic ordering, with evidence of spin canting, providing insights into magnetic exchange pathways.
Conclusions:
- The synthesized formate-based CPs exhibit significant antiferromagnetic behavior and magnetic ordering.
- The structural diversity, including novel chiral and centric structures, is achieved with simple formate ligands.
- Detailed magnetic and structural studies provide a foundation for understanding magnetic exchange in these coordination polymer systems.
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