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Metal Monophosphonates M{(2-C5H4NO)CH2PO3}(H2O)2 (M = Co, Ni, Mn, Cd): Synthesis, Structure, and Magnetism

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journal contribution
posted on 2010-09-20, 00:00 authored by Ting-Hai Yang, Elisabeth S. Knowles, Daniel M. Pajerowski, Jian-Sheng Xia, Liang Yin, Song Gao, Mark W. Meisel, Li-Min Zheng
Four isostructural metal monophosphonates, M{(2-C5H4NO)CH2PO3}(H2O)2 with M = Co (1), Ni (2), Mn (3), and Cd (4), were synthesized and structurally characterized. These compounds show a double-chain structure in which the M2(μ-O)2 dimers are connected by O−P−O bridges. The magnetic responses of 13 were investigated over a wide range of magnetic fields (up to 10 T) and temperatures (down to 50 mK). Except for 4, which is weakly diamagnetic from 2 K to room temperature, the dominant magnetic interactions are antiferromagnetic. Isothermal magnetic field sweeps at 50 mK provide signatures in the magnetic responses that are associated with antiferromagnetic to field-induced fully polarized (magnetically saturated) transitions. Analysis of the magnetic data indicates that 1 and 2 form magnetic dimer-like clusters with weak dimer−dimer interactions present. Contrastingly, the magnetic interactions present in 3 are significantly weaker, so a definitive description of the magnetism of this compound is elusive.