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A multifunctional magnetic material based on a solid solution of Fe(ii)/Co(ii) complexes with a macrocyclic
Bohuslav Drahoš1, Ivan Šalitroš, Ivana Císařová
1Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, CZ-771 46 Olomouc, Czech Republic. bohuslav.drahos@upol.cz.
Dalton Transactions (Cambridge, England : 2003)
|July 29, 2021
Summary
Researchers created a novel Fe/Co solid solution material combining spin crossover and single-molecule magnetism. This multifunctional material demonstrates the success of solid solution methods for advanced magnetic applications.
Area of Science:
- Coordination Chemistry
- Materials Science
- Magnetism
Background:
- Developing multifunctional magnetic materials is crucial for advanced applications.
- Combining spin crossover (SCO) and single-molecule magnetism (SMM) in one material presents a significant challenge.
- The pyridine derivative of cyclam (Py2-C) ligand offers potential for creating such hybrid materials.
Purpose of the Study:
- To synthesize and characterize multifunctional magnetic materials by co-crystallizing Fe(II) and Co(II) complexes.
- To investigate the combination of spin crossover (SCO) and single-molecule magnetism (SMM) properties in a Fe/Co solid solution.
- To explore the utility of solid solution methodology for creating advanced magnetic materials.
Main Methods:
- Co-crystallization of Fe(II) and Co(II) complexes with the Py2-C ligand.
- Preparation and characterization of [MII(Py2-C)](ClO4)2·H2O complexes (MII = Fe, Co, or Fe/Co mixture).
- X-ray crystallography to determine molecular structures.
- Magnetic measurements to assess SCO and SMM properties.
Main Results:
- Fe(II) complex 1 exhibits complete SCO with a transition temperature (T1/2) of 141 K.
- The mixed Fe/Co system 3 also shows SCO (T1/2 = 128 K) and field-induced SMM behavior.
- Co(II) complex 2 acts as a field-induced SMM.
- This is the first Fe/Co solid solution demonstrating both SCO and field-induced SMM properties.
- Light-induced excited spin-state trapping (LIESST) effect was not observed.
Conclusions:
- The solid solution methodology is successful in preparing multifunctional magnetic materials combining SCO and SMM properties.
- The synthesized Fe/Co material represents a significant step towards designing advanced magnetic materials.
- Further investigation is needed to fully understand the interplay between SCO and SMM properties, particularly regarding LIESST effects.
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