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Heterometallic 3d-4f {Co2Gd4} phosphonates: new members of the potential magnetic coolers family

Abstract

Three new heterometallic phosphonate complexes with a novel 3d-4f metal core Co2Gd4 were isolated. The reactions between CoCl2, GdCl3, ligand sodium salts, and 2,2’-bipyridine in methanol solution lead to new unexpected 3d-4f heterometallic complexes [Na2Co III2 Gd4(L)6(bpy)2(OR)2] · nSolv (L = SAA3– (1), BSAA3– (2), and NAA3– (3); bpy = 2,2’-bipyridine; OR = OH, OMe; Solv = H2O, MeOH) composed of a rare case of two magnetically independent oxygen bridged Gd2O2 dinuclear units, which are separated by the O–P–O bridges. According to the BVS calculations and measured magnetic properties, only CoIII ions are present in the obtained complexes. The magnetic properties of the compounds 13 were studied and the entropy changes for the designation of the magnetocaloric effect were calculated. The largest values for the magnetic entropy changes −ΔSM of 20 Jkg−1K−1 for complex 1 have been found for Tav = 2:25 K and Hf = 5 T.

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Publication details

The article was received on 08 Oct 2019, accepted on 27 Nov 2019 and first published on 28 Nov 2019


Article type: Paper
DOI: 10.1039/C9NJ05071J
New J. Chem., 2019, Accepted Manuscript

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    Heterometallic 3d-4f {Co2Gd4} phosphonates: new members of the potential magnetic coolers family

    I. Doroshenko, A. Buchholz, E. Domincova Bergerova, W. Plass and J. Pinkas, New J. Chem., 2019, Accepted Manuscript , DOI: 10.1039/C9NJ05071J

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