I will present an extensive study of the tetrametallic iron cluster compounds, [Fe4Br2(N=CtBu2)4] (1) and [Fe4Br(N=CtBu2)5] (2), which both feature low-valent metal centers and direct metal-metal orbital overlap. Isolation of 1 was achieved upon reaction of FeBr2 with Li(N=CtBu2) (1.5 equiv) and Zn0 (2 equiv). Subsequent reaction of 1 with NaN=CtBu2 resulted in the isolation of 2. Both complexes were characterized by zero-field 57Fe Mössbauer spectroscopy, X-ray crystallography, and SQUID magnetometry. Their tetrahedral [Fe4]6+ cores feature short Fe-Fe interactions (ca. 2.50 Å). Additionally, both 1 and 2 display S = 7 ground states at room temperature and slow magnetic relaxation. AC magnetic susceptibility measurements reveal that relaxation occurs exclusively through an Orbach mechanism, bolstering the use of ferromagnetic direct exchange to generate new, high-performing single-molecule magnets. Additionally, I will discuss my attempts to generate larger, ketimide-supported, Fe clusters.

Metal-metal bonded Fe4 clusters with slow magnetic relaxation

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ACS Fall 2022

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