Ferromagnetic interaction between [Ni(bdt)2]− anions in [Mn2(Saloph)2(μ-OH)][Ni(bdt)2](CH3CN)2

A new molecule-based magnetic material [Mn2(Saloph)2(μ-OH)][Ni(bdt)2](CH3CN)2 was prepared by the metathesis of [Mn(Saloph)(H2O)(ClO4)] (S = 2) and TBA[Ni(bdt)2] (S = 1/2). In the crystal, [Ni(bdt)2]− anions form square lattices which are separated from each other by the layers of antiferromagnetically coupled binuclear cations [Mn2(Saloph)2(μ-OH)]+. The magnetic susceptibility of the material coincides with the sum of the S = 2 van Vleck dimer model and S = 1/2 Heisenberg ferromagnetic square lattice model with 2J = −92.4 and +4.5 K, respectively. The origin of the ferromagnetic interaction can be explained by the T-shaped intermolecular overlap mode of SOMOs which spreads to the ends of [Ni(bdt)2]− molecules.

A new molecule-based magnetic material [Mn2(Saloph)2(μ-OH)][Ni(bdt)2](CH3CN)2 shows ferromagnetic interaction 2J = +4.5 K between [Ni(bdt)2]− anions. The origin of the ferromagnetic interaction is attributed to the orthogonality of the SOMOs and the large overlap between the NOHOMO and the SOMO of adjacent [Ni(bdt)2]− anions.Figure optionsDownload as PowerPoint slide