The first-row transition-metal series of tris(ethyl-enediamine) diacetate complexes [M(en)_3](OAc)_2 (M is Mn, Fe, Co, Ni, Cu, and Zn)

摘要

The crystal structures of the first-row transition-metal series of tris(ethylenedi-amine-κ~2N,N')metal(II) diacetate, [M(C_2H_8N_2)_3](CH_3CO_2)_2, with M = Mn, Fe, Co, Ni, Cu, and Zn, are reported. The complexes are all isostructural, crystallizing in a centrosymmetric triclinic cell and possessing an asymmetric unit composed of one [M(en)_3]~2+ cation and two symmetrically independent acetate anions. In the unit cell, the two complex cations are inversion-generated enantiomers, possessing the energetically favoured Δ(λλλ) and Λ(δδδ) configurations. The complex cations and acetate anions combine through a series of N-H ??? O hydrogen bonds to generate a three-dimensional network in the crystals. The other notable feature of the series is a significant Jahn-Teller distortion for the d~9 Cu~2+ complex.