Synthesis and magnetic properties of a 3-D nickel hydroxide capped by succinate

Abstract

We have successfully synthesized a rare example of an open framework nickel oxide with succinate capping the channels. A honeycomb-like layer of 14-membered rings centered in the (11) plane are connected by vertex-sharing NiO₆ octahedra and water resides in the channels. The structure is only the second example of an extended inorganic–organic hybrid material containing 3-D Ni–O–Ni connectivity and was structurally characterized by single-crystal and powder X-ray diffraction. The material displays excellent chemical stability in aqueous solution from pH ∼ 1 to 13 and thermal stability to ∼375 °C as evidenced by thermogravimetric analysis coupled mass spectroscopy. The Ni²⁺ ions order ferromagnetically below T_c = 5.1 K and anisotropic exchange interactions lead to a field-induced metamagnetic transition and spin-glass-like dependence on cooling conditions in magnetic field.