Reaction of M(II) Diaryls (M = Mn or Fe) with Ammonia to Afford Parent Amido Complexes
摘要:
The reaction of the two-coordinate diaryls MAr'(2) (M = Mn or Fe; Ar' = C6H3-2,6-(C6H3-2,6-Pr-i(2))(2)) with excess NH3 below room temperature afforded the parent amido complexes {Ar' Mn(mu-NH2)(NH3)}, (1) and {Ar' Fe(mu-NH2)}(2) (2) in good yields. The reactions were accompanied by elimination of the arene A,1 H. Both complexes were obtained as dimers in which the metals are bridged by two NH2 ligands. The complex 1 also includes an ammonia (NH3) ligand bound to each manganese. Ammonia complexation did not occur in 2, and the metals remained three-coordinate. The metal electron configurations are high-spin and antiferromagnetically coupled.