Rare earth anthracenedicarboxylate metal-organic frameworks: slow relaxation of magnetization of Nd(3+), Gd(3+), Dy(3+), Er(3+) and Yb(3+) based materials.

We have synthesized a new family of metal-organic-frameworks (MOFs) based on a 9,10-anthracenedicarboxylate linker. We report the formation of lanthanide-based MOFs using soft solvothermal routes with dimethylformamide as a solvent. These materials display intense photoluminescence properties in the solid state at room temperature. What is more interesting is, some of them exhibit slow relaxation of magnetization with activation barriers of 22.9, 15.4, 52.7, 13.0 and 16.2 K for Nd(3+), Gd(3+), Dy(3+), Er(3+) and Yb(3+), respectively. To the best of our knowledge, Nd(3+) and Yb(3+) materials are the first examples of 3D- and 2D-MOFs, respectively, that show slow relaxation of magnetization.

Luminescence and Magnetic Properties of Two Three-Dimensional Terbium and Dysprosium MOFs Based on Azobenzene-4,4'-Dicarboxylic Linker.

We report the in situ formation of two novel metal-organic frameworks based on terbium and dysprosium ions using azobenzene-4,4'-dicarboxylic acid (H2abd) as ligand, synthesized by soft hydrothermal routes. Both materials show isostructural three-dimensional networks with channels along a axis and display intense photoluminescence properties in the solid state at room temperature. Textural properties of the metal-organic frameworks (MOFs) have been fully characterized although no appreciable porosity was obtained. Magnetic properties of these materials were studied, highlighting the dysprosium material displays slightly frequency-dependent out of phase signals when measured under zero external field and under an applied field of 1000 Oe.

In vivo potential antidiabetic activity of a novel zinc coordination compound based on 3-carboxy-pyrazole.

A novel Zn mononuclear complex with 3-carboxy-pyrazole ligand has been prepared using conventional routes and characterized by X-ray diffraction. The structure consists of discrete neutral [Zn(C6H3N2O2)2(H2O)2] molecules held together by hydrogen interactions. This compound exhibits a potential in vivo antidiabetic activity and the in vitro toxicity can be considered negligible.

Modular structure of a robust microporous MOF based on Cu2 paddle-wheels with high CO2 selectivity.

The synthesis of a new MOF with Cu2 paddle-wheels connected to glutarate and 1,3-bis(4-pyridyl)propane linkers has been explored. Experimental gas adsorption measurements reveal that the MOF is essentially non-porous to methane whereas it presents a type III isotherm upon CO2 adsorption, leading to high capacity and outstanding CO2 selectivity.