(NEt4)[Mn2(5-MeOsalen)2Fe(CN)6] (5-MeOsalen2- = N, N’-ethylenebis(5-methoxysalicylideneiminate)) is a heterometallic one-dimensional assembly made of the trinuclear [MnIII(SB)-NC-FeIII-CN-MnIII(SB)] (SB is a salen-type Schiff-base ligand). The compound has two types of bridges, a cyano bridge (-NC-) and a biphenolate bridge (-(O)2-), connecting MnIII and FeIII ions and the two MnIII ions, respectively. Both bridges mediate ferromagnetic interactions,