Field-Induced Magnetic Transitions in Metal Phosphonates with Ladderlike Chain Structures: (NH<sub>3</sub>C<sub>6</sub>H<sub>4</sub>NH<sub>3</sub>)M<sub>2</sub>(hedpH)<sub>2</sub>·H<sub>2</sub>O [M = Fe, Co, Mn, Zn; hedp = C(CH<sub>3</sub>)(OH)(PO<sub>3</sub>)<sub>2</sub>]
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This paper reports the syntheses and characterization of four isomorphous compounds (NH3C6H4NH3)M2(hedpH)2·H2O [M = Fe (1), Co (2), Mn (3), Zn (4); hedp = C(CH3)(OH)(PO3)2]. Each contains two crystallographically different kinds of {M2(hedpH)2}n double chains, where the {M2(μ-O)2} dimer units are connected by O−P−O bridges. The double chains are connected through extensive hydrogen bonds, hence generating a three-dimensional supramolecular network. The temperature-dependent magnetic susceptibility measurements show dominant antiferromagnetic interactions in compounds 1−3, mediated through the μ-O and/or O−P−O bridges between the metal(II) centers. The magnetization measurements reveal that compounds 1−3 experience field-induced magnetic transitions at low temperatures.
