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Exchange-bias quantum tunnelling in a CO2-based Dy4-single molecule magnet
Eufemio Moreno Pineda1, Yanhua Lan2, Olaf Fuhr1
1Institute of Nanotechnology (INT) , Karlsruhe Institute of Technology (KIT) , Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen , Germany .
Chemical Science
|April 29, 2017
Summary
Researchers explored carbamate formation from carbon dioxide (CO2) using lanthanides and amines. This created a Dy4 cage acting as a single molecule magnet, demonstrating quantum tunneling and potential for spintronic devices.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Quantum Magnetism
Background:
- Carbamate formation is crucial for CO2 conversion in plants via RuBisCO.
- Lanthanide complexes offer potential for novel magnetic materials.
Purpose of the Study:
- To synthesize and characterize a lanthanide-carbamate cage.
- To investigate the magnetic properties of the resulting Dy4 complex.
- To explore its potential as a single molecule magnet.
Main Methods:
- Lanthanide-mediated carbamate formation using a secondary amine.
- X-ray crystallography for structural determination.
- Magnetic susceptibility measurements and analysis.
Main Results:
- A tetranuclear dysprosium carbamate cage, [Dy4(O2CNiPr2)12], was synthesized.
- The Dy4 cage exhibits slow magnetic relaxation and hysteresis, behaving as a single molecule magnet.
- Evidence of both ferromagnetic and antiferromagnetic exchange interactions was observed.
- Exchange-bias quantum tunneling was detected with distinct hysteresis loops.
Conclusions:
- The [Dy4(O2CNiPr2)12] cage functions as a quantum magnet.
- The observed magnetic phenomena are attributed to competing exchange interactions between dysprosium ions.
- This Dy4 complex shows promise for applications in hybrid spintronic devices, utilizing CO2 as a feedstock.
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