"-nitrito-1:2 2 N:O;2:3 2 O:N-dinickel(II)cobalt(II), [CoNi 2 (NO 2) 2 (C 19 H 22 N 2 O 2) 2 (C 3 H 7 NO) 2 ], (I),-copper(II), [CuNi 2 (NO 2) 2 (C 19 H 22 N 2 O 2) 2 (C 3 H 7 NO) 2 ], (II), and-manganese(II), [MnNi 2 (NO 2) 2 (C 19 H 22 N 2 O 2) 2 (C 3 H 7 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 Co 2+ , Cu 2+ or Mn 2+) in each complex, involving two O atoms of a "-N,N Hbis(salicylidene)-2,2 H dimethyl-1,3-propanediaminate ligand and an NÐO moiety of a "-nitrito group. The coordination sphere around each metal atom, whether Co 2+ , Cu 2+ , Mn 2+ or Ni 2+ , can be described as distorted octahedral. The NiÁ Á ÁM distances are 2.9988 (5) A Ê in (I), 2.9872 (5) A Ê in (II) and 3.0624 (8) A Ê in (III).
A new tetranuclear Cu(II)-Hg(II)-Hg(II)-Cu(II) complex, [Cu(2)Hg(2)Cl(4)(C(18)H(18)N(2)O(2))(2)], has been prepared by means of a copper complex found in the literature. The molecular structure of this complex was determined by X-ray diffraction and the Cu-Hg-Hg-Cu chain was seen to be non-linear. The change in magnetic susceptibility with temperature was recorded for this complex and observed to abide by the Curie-Weiss law. The coordination around the Hg(II) ions is square pyramidal. The Cu...Hg bridging distance is 3.5269(7)A.
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