Tris(2,2′-bipyridine-κ 2 N,N′)cobalt(III) tris-(oxalato-κ 2O 1,O 2)ferrate(III) monohydrate

Abstract

The title compound, [Co(C 10H 8N 2) 3][Fe(C 2O 4) 3]·H2O, con-sists of two discrete tris-(chelate) metal ions (Co IIIN 6 and Fe IIIO 6 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.