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Synthesis and crystal structure of [Nd(H2O)2]2(C2O4)3

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Abstract

Some crystals of [Nd(H2O)2]2(C2O4)3 were synthesized hydrothermally by heating at 200°C for 8 days an aqueous suspension of neodymium oxalate decahydrate in presence of terephthallic acid and guanidinium carbonate. They crystallize in the orthorhombic system, space group P212121, with a = 8.6702(7) Å, b = 9.558(2) Å, and c = 17.009(2) Å. The structure of this complex is built up by two independent neodymium atoms, three bischelating oxalate ligands, and four water molecules forming a rectangle building unit of 6-membered ring, [Ln(H2O)2(C2O4)]6. The packing of these units leads to a layer parallel to the plane (001). However, the neodymium atoms of two neighbor layers share an edge of oxalato oxygen atoms thus giving a double-layer. The three dimensionality between these double-layers is insured by hydrogen bonds of water molecules which are bound to the neodymium atoms. There is no “zeolitic water molecule.” The two neodymium atoms are nine-coordinated. In both cases, the coordination polyhedron can be described as a distorted tricapped trigonal prism.

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  1. CEMES, 29 rue J. Marvig, B.P. 4143, 31055, Toulouse cedex 4, France

    J.C. Trombe & J. Jaud

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  1. J.C. Trombe
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  2. J. Jaud
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Correspondence to J.C. Trombe.

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Trombe, J., Jaud, J. Synthesis and crystal structure of [Nd(H2O)2]2(C2O4)3 . Journal of Chemical Crystallography 33, 19–26 (2003). https://doi.org/10.1023/A:1021343631792

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