Syntheses of ten new tetranuclear complexes containing the [M A (µ 3 -O) 2 M B ] 8+ butterfly core [M A = M B = Fe III (1 and 2), M A = M B = Mn III (3 and 4) and M A = Fe III , M B = Mn III (5−10)]using 1,4,7-trimethyl-1,4,7-triazacyclononane (L) as the capping ligand, salicylaldoximato dianion (salox 2− ) and six different carboxylate anions as bridging ligands, are described. (8) were determined by X-ray crystallography. The complexes are isostructural, with M III ions disposed in a butterfly core where bridging between the M III ions occurs via two µ 3 -oxo anions. In complexes 5, 6 and 8 the ''wing-tip'' positions of the butterfly are occupied by the LFe 3+ units, whereas the ''body'' metal ions are d 4 high-spin Mn III ions. Complexes 1−10 have been characterised by variable-tem- [a]