Unusual Iron(II) and Cobalt(II) Complexes Derived from Monodentate Arylamido Ligands<sup>#</sup>

The coordination chemistry of the N-substituted arylamido ligands [N(R)(C<sub>6</sub>H<sub>3</sub>R‘<sub>2</sub>-2,6)] [R = SiMe<sub>3</sub>, R‘ = Me (L<sup>1</sup>); R = CH<sub>2</sub>Bu<i><sup>t</sup></i><sup></sup>, R‘ = Pr<i><sup>i</sup></i><sup></sup> (L<sup>2</sup>)] toward Fe<sup>II</sup> and Co<sup>II</sup> ions was studied. The monoamido complexes [M(L<sup>1</sup>)(Cl)(tmeda)] [M = Fe (<b>1</b>), Co (<b>2</b>)] react readily with MeLi, affording the mononuclear, paramagnetic iron(II) and cobalt(II) methyl−arylamido complexes [M(L<sup>1</sup>)(Me)(tmeda)] [M = Fe (<b>3</b>), Co (<b>4</b>)]. Treatment of 2:1 [Li(L<sup>2</sup>)(THF)<sub>2</sub>]/FeCl<sub>2</sub> affords the unusual two-coordinate iron(II) bis(arylamide) [Fe(L<sup>2</sup>)<sub>2</sub>] (<b>5</b>).