Abstract
An anisotropic EPR spectrum observed at 20 K in γ-irradiated single crystals of Cr(CO)6 doped with Fe(CO)5 is ascribed to the radical anion Fe(CO)−5. Measurements of the g-, 57Fe-, and 13C-hyperfine tensors clearly show that the species is an acyl radical Fe(CO)−4CO in which the unpaired spin is principally located in Fe 3dz2 or 3dx2−y2 and in an sp2 hybrid of the unique carbon atom C(1). The Fe–C(1)−O(1) moiety is bent and its plane lies close to the ac crystallographic plane of Cr(CO)6.
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