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Magnetic Hysteresis in a Dysprosium Bis(amide) Complex
Florian Benner1, Rashmi Jena1, Aaron L Odom1
1Department of Chemistry, Michigan State University, 578 South Shaw Lane, East Lansing, Michigan 48824, United States.
Journal of the American Chemical Society
|February 27, 2025
Summary
Two new dysprosium molecules were synthesized and characterized as single-molecule magnets. Removing a chloride ion significantly enhanced magnetic properties, setting new records for mononuclear dysprosium single-molecule magnets.
Area of Science:
- Coordination Chemistry
- Materials Science
- Quantum Magnetism
Background:
- Dysprosium (Dy) complexes are investigated for single-molecule magnet (SMM) applications.
- Tuning ligand environments is crucial for optimizing SMM performance.
Purpose of the Study:
- Synthesize and characterize two novel mononuclear dysprosium complexes.
- Investigate the impact of halide ion removal on magnetic properties.
- Establish new benchmarks for mononuclear SMMs.
Main Methods:
- Single-crystal X-ray diffraction
- UV-vis spectroscopy
- SQUID magnetometry
- *Ab initio* calculations
Main Results:
- Two mononuclear dysprosium complexes, (NHAr*)2DyCl (1) and [(NHAr*)2Dy][BArF24] (2), were synthesized.
- Both complexes exhibit single-molecule magnet behavior with hysteresis.
- Complex 2, lacking a chloride ion, shows enhanced properties: higher blocking temperature (TB = 19.0 K) and coercivity (HC = 1.03 T).
- These values represent records for mononuclear SMMs with amide functionalities.
Conclusions:
- Halide ion extrusion significantly impacts magnetic relaxation dynamics in dysprosium complexes.
- Complex 2 demonstrates record-breaking performance for mononuclear SMMs, highlighting the potential of this molecular design.
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