Crystal structure of bis(μ-{2-[(5-bromo-2-oxidobenzylidene)amino]ethyl}sulfanido-κ³ N,O,S){2,2′-[(3,4-dithiahexane-1,6-diyl)bis(nitrilomethanylylidene)]bis(4-bromophenolato)-κ⁴ O,N,N′,O′}dicobalt(III) dimethylformamide monosolvate

Abstract

The title binuclear CoIII complex, [Co2(C9H8BrNOS)2(C18H16Br2N2O2S2)]·C3H7NO, with a Schiff base ligand formed in situ from cysteamine (2-aminoethanethiol) and 5-bromosalicylaldehyde crystallizes in the space group P21. It was found that during the synthesis the ligand undergoes spontaneous oxidation, forming the new ligand H2 L′ having an S—S bond. Thus, the asymmetric unit consists of one Co2(L)2(L′) molecule and one DMF solvent molecule. Each CoIII ion has a slightly distorted octahedral S2N2O2 coordination geometry. In the crystal, the components are linked into a three-dimensional network by several S... Br, C... Br, C—H...Br, short S...C (essentially shorter than the sum of the van der Waals radii for the atoms involved) contacts as well by weak C—H...O hydrogen bonds. The crystal studied was refined as an inversion twin.

Direct synthesis and crystal structure of a novel tetranuclear Co2IIIFe2III Schiff base complex

“…Solvents were dried and purified using standard procedures [17]. The synthetic method, direct synthesis, has been intensively used and reported in literature [16,[18][19][20]. Its basis lies in the oxidative dissolution of metal(s) during the synthesis.…”