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Utilizing a hexadentate ligand platform, a high-spin trinuclear iron complex of the type ((tbs)L)Fe(3)(thf) was synthesized and characterized ([(tbs)L](6-) = [1,3,5-C(6)H(9)(NPh-o-NSi(t)BuMe(2))(3)](6-)). The silyl-amide groups only permit ligation of one solvent molecule to the tri-iron core, resulting in an asymmetric core wherein each iron ion exhibits a distinct local coordination environment. The triiron complex ((tbs)L)Fe(3)(thf) rapidly consumes inorganic azide ([N(3)]NBu(4)) to afford an anionic, trinuclear nitride complex [((tbs)L)Fe(3)(μ(3)-N)]NBu(4). The nearly C(3)-symmetric complex exhibits a highly pyramidalized nitride ligand that resides 1.205(3) Å above the mean triiron plane with short Fe-N (1.871(3) Å) distances and Fe-Fe separation (2.480(1) Å). The nucleophilic nitride can be readily alkylated via reaction with methyl iodide to afford the neutral, trinuclear methylimide complex ((tbs)L)Fe(3)(μ(3)-NCH(3)). Alkylation of the nitride maintains the approximate C(3)-symmetry in the imide complex, where the imide ligand resides 1.265(9) Å above the mean triiron plane featuring lengthened Fe-N(imide) bond distances (1.892(3) Å) with nearly equal Fe-Fe separation (2.483(1) Å).

Oxidative Group Transfer to a Triiron Complex to Form a Nucleophilic μ3-Nitride, [Fe3(μ3-N)]−

Oxidative Group Transfer to a Triiron Complex to Form a Nucleophilic μ³-Nitride, [Fe₃(μ³-N)]⁻