Chalcogen-atom abstraction reactions of a Di-iron imidophosphorane complex†
Luis M.
Aguirre Quintana, 
a
Arun
Ramanathan,
a
Ningxin
Jiang,
a
Laurent
Maron
b
and
Henry S.
La Pierre
*ac
a
Arun
Ramanathan,
a
Ningxin
Jiang,
a
Laurent
Maron
b
and
Henry S.
La Pierre
*ac
Abstract
Reaction of the complexes [Fe2(μ2-NP(pip)3)2(NP(pip)3)2] (1-Fe) and [Co2(μ2-NP(pip)3)2(NP(pip)3)2] (1-Co), where [NP(pip)3]1− is tris(piperidinyl)imidophosphorane, with nitrous oxide, S8, or Se0 results in divergent reactivity. With nitrous oxide, 1-Fe forms [Fe2(μ2-O)(μ2-NP(pip)3)2(NP(pip)3)2] (2-Fe), with a very short Fe3+–Fe3+ distance. Reactions of 1-Fe with S8 or Se0 result in the bridging, side-on coordination (μ-κ1:κ1-E22−) of the heavy chalcogens in complexes [Fe2(μ-κ1:κ1-E2)(μ2-NP(pip)3)2(NP(pip)3)2] (E = S, 3-Fe, or Se, 4-Fe). In all cases, the complex 1-Co is inert.
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