Two-Coordinate Iron(I) Complex [Fe{N(SiMe3)2}2]- : Synthesis, Properties, and Redox Activity

First-row two-coordinate complexes are attracting much interest. Herein, we report the high-yield isolation of the linear two-coordinate iron(I) complex salt [K(L)][Fe{N(SiMe3)(2)}(2)] (L=18-crown-6 or crypt-222) through the reduction of either [Fe{N(SiMe3)(2)}(2)] or its three-coordinate phosphine adduct [Fe{N(SiMe3)(2)}(2)(PCy3)]. Detailed characterization is gained through X-ray diffraction, variable-temperature NMR spectroscopy, and magnetic susceptibility studies. One- and two-electron oxidation through reaction with I-2 is further found to afford the corresponding iodo iron(II) and diiodo iron(III) complexes.