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Synthesis and Characterization of a Linear Triiron(II) Extended Metal Atom Chain Complex with Fe-Fe Bonds.
Gary L Guillet1, Kathleen Y Arpin1, Alan M Boltin1
1Department of Chemistry and Biochemistry, Georgia Southern University, 11935 Abercorn Street, Savannah, Georgia 31419, United States.
Inorganic Chemistry
|August 18, 2020
Summary
Researchers synthesized the first linear triiron(II) complex with iron-iron bonds. This extended metal atom chain (EMAC) complex exhibits a high spin ground state, indicating ferromagnetic coupling for unique magnetic properties.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Magnetochemistry
Background:
- Extended metal atom chain (EMAC) complexes with first-row transition metals offer unique magnetic properties and reactivity.
- The synthesis of late-first-row transition metal EMACs, particularly triiron species with Fe-Fe bonding, remained incomplete.
Purpose of the Study:
- To report the synthesis and characterization of the first linear triiron(II) complex with significant Fe-Fe interactions.
- To investigate the magnetic properties and electronic structure of this novel triiron EMAC.
Main Methods:
- Synthesis of the triiron(II) complex supported by 2,6-bis[(trimethylsilyl)amido]pyridine ligands.
- Characterization using X-ray diffraction, 1H NMR, cyclic voltammetry, electronic absorption, and Mössbauer spectroscopy.
- Magnetic susceptibility measurements via the Evans method.
Main Results:
- The first linear triiron(II) complex, Fe3L, with close Fe-Fe interactions was successfully synthesized.
- Structural analysis revealed pseudohelical ligand coordination and trigonal-planar geometry at each iron center.
- Magnetic studies indicated a high spin ground state (S = 6), suggesting ferromagnetic coupling within the triiron chain.
Conclusions:
- The successful synthesis of Fe3L expands the library of late-first-row transition metal EMACs.
- The observed ferromagnetic coupling highlights the potential for novel magnetic behaviors in these systems.
- This work provides a foundation for exploring further reactivity and applications of iron-based EMACs.
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