文摘
The first spin-crossover cluster helicate [{FeII(μ-bpt)3}2FeII3(μ3-O)][FeII2(μ-Cl)(μ-bpt)(NCS)4(H2O)]·2H2O·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 [FeII(bpt)3]− unit wrapped a rare planar [FeII3(μ3-O)]4+ core to form a bis(triple-helical) cation with trigonal-bipyramidal topology. The origin of different magnetic behaviors of two [FeII(bpt)3]− units could be ascribed to their different intermolecular interactions.