There has been considerable interests indinuclear and tetranuclear manganese complexes, because such manganese units play an important role in some manganese-active enzymes[1].Dinucleating Schiff-base ligand, 1,3-bis(salicylideneamino)-2-propanol, is useful to construct mononuclear, tetranuclear, and polynuclear manganese complexes [2-4].Recently, we synthesized tetranuclear manganese complexes using the 3-methoxy-substituted Schiff-base ligands, 1,3-bis(3-methoxysalicylideneamino)-2-propanol (H3msap) and its 5-bromo-substituted derivative (H3bmsap)[5,6].In this study, we isolated octanuclear manganese species with an incomplete-double-cubane core. The isolated complexes were characterized by elemental analyses, IR and UV-vis spectra, and single-crystal X-ray structure analysis, elucidating the chemical formula of[Mn8(bmsap)2(ClC6H5COO)8(O)4(MeOH)2(H2O)2]as shown in Figure. We report here the synthesis and crystal structures of these mixed-valent MnIII2MnII6complexes.