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artículo con referato
"Synthesis, Crystal Structure, and Magnetic Properties of the Mixed-Ligand Complex [Gd(CF3CO2)3(phen)2(H2O)]"
A. Rizzi, R. Baggio, R. Calvo, M.T. Garland, O. Peña and M. Perec
Inorg. Chem. 40(14) (2001) 3623-3635
The mixed ligand complex [Gd(F3CCO2)3(phen)2(H2O)] has been synthesized and the structure determined by single crystal X-ray analysis. The complex crystallizes in the triclinic space group P-1 with a = 11.889(2)Å, b = 12.158(2)Å, c = 13.225(2)Å, α = 76.69(1)°, β = 85.59(1)°, γ = 62.90(1)° and Z = 2. The Gd(III) ion is nine-coordinate in a GdN4O5 core and two such cores are double-bridged by H-bonds between carboxylate and aqua ligands with a Gd-Gd separation of 7.16(1)Å. The compound follows a Curie-Weiss law in the range 5-300 K with the expected magnetic moment for a Gd(III) free ion. EPR measurements at 300 and 120 K indicate weak magnetic exchange coupling (0.1 K < |J|/k < 1 K), of the extended 3D type.
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