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Published on: April 14, 2020
High-nuclearity 3d-4f [FeIII5LnIII8] complexes: synthesis, structure and magnetic properties
Ayuk M Ako1, Valeriu Mereacre, Rodolphe Clérac
1Institut für Anorganische Chemie der Universität Karlsruhe, Karlsruhe, German.
Dalton Transactions (Cambridge, England : 2003)
|February 15, 2008
Summary
The largest iron-lanthanide clusters, [FeIII5LnIII8], exhibit unique magnetic properties. These mixed-metal aggregates show ferrimagnetic or ferromagnetic behavior, leading to distinct spin ground states.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Magnetochemistry
Background:
- Mixed-metal clusters are of interest for their unique magnetic and electronic properties.
- Lanthanide-containing clusters offer opportunities for novel magnetic behaviors due to their unpaired f-electrons.
Purpose of the Study:
- To synthesize and characterize novel, large mixed-metal clusters involving iron and lanthanides.
- To investigate the magnetic properties and magnetic ordering in these isostructural aggregates.
Main Methods:
- Synthesis of isostructural tridecanuclear mixed-metal aggregates with the formula [FeIII5LnIII8] where Ln = Pr, Nd, Gd.
- Magnetic property measurements to determine the magnetic interactions and ground state spin.
Main Results:
- The largest [Fe-Ln] clusters reported to date, with a tridecanuclear [FeIII5LnIII8] structure, were successfully synthesized.
- Magnetic studies revealed a ferrimagnetic arrangement in [Fe5Pr8] and [Fe5Nd8] aggregates.
- Ferromagnetic interactions were dominant in the [Fe5Gd8] aggregate, resulting in a large spin ground state.
Conclusions:
- The synthesized [FeIII5LnIII8] aggregates represent a new class of large, isostructural mixed-metal clusters.
- The observed magnetic behaviors (ferrimagnetic and ferromagnetic) are dependent on the specific lanthanide ion incorporated.
- These findings contribute to the understanding of magnetic interactions in complex lanthanide-containing systems.
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