The first spin-crossover cluster helicate [{Fe-II(mu-bpt)(3)}(2)Fe-3(II)(mu(3)-O)] [Fe-2(II)(mu-Cl) (mu-bpt) (NCS)(4)(H2O)center dot](2)H2O center dot C2H5OH [Hbpt = 3,5-bis(pyridin-2-yl)-1,2,4-triazole] was reported, in which one spin crossover unit and one low-spin triple-stranded [Fe-II(bpt)(3)](-) unit wrapped a rare planar [Fe-3(II)(mu(3)-O)](4+) :core to form. a bis(triple-helical) cation with trigonal-bipyramidal topology. The origin of different magnetic behaviors of two [Fe-II(bpt)(3)](-) units could be ascribed to their different intermolecular interactions.