2D molecular square grid of Cobalt(II) with tridentate phenylglycinate and mandelate: structure and magnetism |
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Authors: | Hitoshi Kumagai Katsuya Inoue |
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Institution: | a Applied Molecular Science, Institute for Molecular Science (IMS), Nishigounaka 38, Myoudaiji, Okazaki 444-8585, Japan b Japan Department of Structural Molecular Science, The Graduate University for Advanced Studies, Nishigounaka 38, Myoudaiji, Okazaki 444-8585, Japan c Institut de Physique et Chimie des Matériaux de Strasbourg, 23 Rue du Loess, BP 43, 67034, Strasbourg, Cedex2, France |
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Abstract: | The hydrothermal synthesis, single crystal X-ray structures and magnetic properties of two layered cobalt-carboxylate complexes, ∞2CoII(O2C∗CH(OH)C6H5)2] (1) and ∞2CoII(O2C∗CH(NH2)C6H5)2] (2), where O2CCH(OH)C6H5 is mandalate and O2CCH(NH2)C6H5 is phenylglycinate, are described. Pale pink crystals of 1 and 2 were obtained by the reaction of cobalt nitrate and the enantiomer-pure acids at 120 °C. In each case, the structure consists of stacks of quasi square-grid polymeric sheets consisting of carboxylato- bridges, M-O-C-O-M, and the presence of both d- and l-enantiomers of the ligands segregated on each face of the layer. The ligands exhibit both chelating and bridging functions with the carboxylate group adopting an anti-anti mode. The magnetic properties are characteristic of weakly interacting paramagnets where the moments are elevated by an important orbital contribution via spin-orbit coupling. |
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Keywords: | Cobalt Layer Mandelic acid Magnetism Phenylglycine Square-grid |
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