Crystal structure of bis(μ-{2-[(5-bromo-2-oxidobenzylidene)amino]ethyl}sulfanido-κ3N,O,S){2,2′-[(3,4-dithiahexane-1,6-diyl)bis(nitrilomethanylylidene)]bis(4-bromophenolato)-κ4O,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 H2L′ 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.

Keywords

• crystal structure
• binuclear CoIII complex
• Schiff bases
• 5-bromosalicylaldehyde
• cysteamine (2-aminoethanthiol)