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New binuclear ferrocenecarboxylates of rare-earth metals as precursors for ferrites: Syntheses, structures, and solid-phase thermolysis

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Abstract

New ferrocenecarboxylates of rare-earth metals, [Ln2(μ-O,η2-OOCFc)22-O,O′-OOCFc)22-NO3)2(DMSO)4] (Ln = Gd (I), Tb (II), and Y (III)) and [Gd2(μ-O,η2-OOCFc)22-OOCFc)4(DMSO)2(H2O)2] · 2DMSO · 2CH2Cl2 (IV), are synthesized and characterized by X-ray diffraction analysis. Unlike all earlier known ferrocenecarboxylates of rare-earth metals, in isostructural compounds I–III the Ln atoms are linked by four bridging carboxyl residues, two of which are chelate-bridging (the coordination number of Ln is 9). Binuclear structure IV is formed by two chelate-bridging carboxylate ligands (the coordination number of Gd is 9). Weak antiferromagnetic and weak ferromagnetic interactions between the Gd atoms are observed in complexes I and IV, respectively. The thermal decomposition of the synthesized compounds is studied by differential scanning calorimetry and thermogravimetry. According to the X-ray diffraction data, the final thermolysis products of the complexes in air are garnets Ln3Fe5O12.

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Correspondence to P. S. Koroteev.

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Dedicated to the 80th Anniversary of the Kurnakov Institute of General and Inorganic Chemistry

Original Russian Text © P.S. Koroteev, Zh.V. Dobrokhotova, N.N. Efimov, A.B. Ilyukhin, V.M. Novotortsev, 2014, published in Koordinatsionnaya Khimiya, 2014, Vol. 40, No. 7, pp. 438–448.

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Koroteev, P.S., Dobrokhotova, Z.V., Efimov, N.N. et al. New binuclear ferrocenecarboxylates of rare-earth metals as precursors for ferrites: Syntheses, structures, and solid-phase thermolysis. Russ J Coord Chem 40, 495–504 (2014). https://doi.org/10.1134/S1070328414070045

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