Two heterometal assemblies, [(CuLMnII)-L-II-Mn-2(hfac)] (2) and [(CuLMnII)-L-II-Mn-3(hfac)] (3), have been synthesized by the assembly reaction of "bridging ligand-complex" Na[(CuLn)-L-II] (n = 2, 3) and [Mn-II(hfac)(2)(H2O)(2)], where H3L2 = 1-(2-hydroxy-3-methoxybenzamido) -2-(2-hydroxybenzylideneamino) ethane, H3L3 = 1-(2-hydroxy-3-methoxybenzamido)-2-(2-hydroxy-3-methoxybenzylideneamino) ethane, and Hhfac = hexafluoroacetylacetone. The temperature-dependent magnetic susceptibility and field-dependent magnetization data demonstrated that 3 was well-reproduced by a cyclic tetranuclear structure, while those of 2 indicated an infinite linear chain structure.