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