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Acta Crystallographica Section C: Crystal Structure Communications, cilt.58, sa.3, 2002 (SCI-Expanded)
The title compounds, bis(dimethylformamide)-1κO, 3κO- bis{μ-2, 2′-[2, 2′-dimethylpropane-1, 3-diylbis(nitrilomethylidyne)] diphenolato}-1κ4N, N′, O, O′:2κ2O, O′;2κ2O, O′:3κ4N, N′, - O, O′-di-μ-nitrito-1:2κ2N:O;2:3κ2O:N- dinickel(II)cobalt(II), [CoNi2(NO2)2 (C19H22N2O2)2 (C3H7NO)2], (I), -copper(II), [CuNi2(NO2)2(C19H22 N2O2)2(C3H7 NO)2], (II), and -manganese(II), [MnNi2(NO2)2(C19H22 N2O2)2(C3H7 NO)2], (III), consist of centrosymmetric linear heterotrinuclear metal complexes. The three complexes are isostructural. There are three bridges across the Ni-M atom pairs (M is Co2+, Cu2+ or Mn2+) in each complex, involving two O atoms of a μ-N, N′-bis(salicylidene)-2, 2′dimethyl-1.3-propanediaminate ligand and an N-O moiety of a μ-nitrito group. The coordination sphere around each metal atom, whether Co2+, Cu2+, Mn2+ or Ni2+, can be described as distorted octahedral. The Ni⋯M distances are 2.9988 (5) Å in (I), 2.9872 (5) Å in (II) and 3.0624 (8) Å in (III).