Tris(2,2′-bipyridine-κ²N,N′)cobalt(III) tris­(oxalato-κ²O¹,O²)ferrate(III) mono­hydrate

The title compound, [Co(C₁₀H₈N₂)₃][Fe(C₂O₄)₃]·H₂O, con­sists of two discrete tris­(chelate) metal ions (Co^IIIN₆ and Fe^IIIO₆ chromophores) and a water mol­ecule. The structure is highly symmetrical; the Co^III and Fe^III ions occupy positions with site symmetry 3.2. The coordination polyhedra of the metal atoms have a nearly octa­hedral geometry with noticeable trigonal distortions. The Co—N and Fe—O bond lengths are equal by symmetry, viz. 1.981 (2) and 1.998 (4) Å, respectively. The cations and anions are arranged alternately along their threefold rotation axes parallel to [001], forming chains that are packed in a hexa­gonal manner. The water mol­ecules occupy voids between the chains. The crystal under investigation was an inversion twin.

Bis(μ-4-nitro-2-{[2-(oxidometh­yl)phen­yl]imino­meth­yl}phenolato)bis­[chlorido(dimethyl sulfoxide)­iron(III)] dimethyl sulfoxide disolvate

In the centrosymmetric dimeric title complex, [Fe₂(C₁₄H₁₀N₂O₄)₂Cl₂(C₂H₆OS)₂]·2C₂H₆OS, two {Fe(L)Cl(DMSO)} units (L is the tridentate ligand 4-nitro-2-{[2-(oxidometh­yl)phen­yl]imino­meth­yl}phenolate; DMSO is dimethyl sulfoxide) are bridged by two O atoms, with an Fe...Fe separation of 3.1838 (8) Å. The coordination polyhedron of the Fe^III atoms can be described as distorted octa­hedral, with four Fe—O, one Fe—N and one Fe—Cl coordination bonds. The L ligand is not planar, the dihedral angle between the 2-(oxidometh­yl)phen­yl]imino and 4-nitro-2-(imino­meth­yl)phenolate planes being 48.54 (9)°. The solvent DMSO molecule is disordered over two orientations with equal occupancy.