Synthesis and Characterization of a Linear Triiron(II) Extended Metal Atom Chain Complex with Fe–Fe Bonds

• DOI: 10.1021/acs.inorgchem.0c01625
• Publication Date: 2020-07-31T21:18:56Z
• Authors: Gary L. Guillet; Kathleen Y. Arpin; Alan M. Boltin; Jesse B. Gordon; Justin A. Rave; Patrick C. Hilles...
• Keywords: Characterization; Chain (unit)

Extended metal atom chain (EMAC) complexes of first-row transition metals with metal-metal bonds have the potential to elicit unique magnetic properties and reactivities. Until now, library EMAC late-first-row was incomplete because omission a triiron species Fe-Fe bonding. Herein we report synthesis preliminary investigation first linear, triiron(II) complex containing close interactions. The is supported by three dianionic 2,6-bis[(trimethylsilyl)amido]pyridine ligands (L), an overall composition Fe3L3, pseudohelical ligand coordination stabilizing local trigonal-planar geometry at each iron. Fe3L3 characterized X-ray diffraction, 1H NMR, cyclic voltammetry, electronic absorption, Mössbauer spectroscopies. Evans method analysis indicated large uncompensated spin S = 6 ground state, suggesting ferromagnetic coupling in chain, likely due direct exchange.