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

Warning

This publication doesn't include Institute of Computer Science. It includes Faculty of Science. Official publication website can be found on muni.cz.
Authors

DOROSHENKO Iaroslav BUCHHOLZ Axel BERGEROVA Eva Domincova PLASS Winfried PINKAS Jiří

Year of publication 2020
Type Article in Periodical
Magazine / Source New Journal of Chemistry
MU Faculty or unit

Faculty of Science

Citation
Web http://dx.doi.org/10.1039/c9nj05071j
Doi http://dx.doi.org/10.1039/c9nj05071j
Keywords TRANSITION-METAL-COMPLEXES; CLUSTERS; CAGES; GD; SYMMETRY; SHAPE; LANTHANIDES; DESIGN; LN
Description 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, [Na(2)CoIII2Gd(4)(L)(6)(bpy)(2)(OR)(2)]center dot nSolv (L = SAA(3-) (1), BSAA(3-) (2), and NAA(3-) (3); bpy = 2,2 '-bipyridine; OR = OH and OMe; Solv = H2O and MeOH), composed of a rare case of two magnetically independent oxygen bridged Gd2O2 dinuclear units, which are separated by O-P-O bridges. According to the BVS calculations and measured magnetic properties, only Co-III ions are present in the obtained complexes. The magnetic properties of the compounds 1-3 were studied and the entropy changes for the designation of the magnetocaloric effect were calculated. The largest value for the magnetic entropy change -Delta S-M of 20 J kg(-1) K-1 for complex 1 has been found for T-av = 2.25 K and H-f = 5 T.
Related projects:

You are running an old browser version. We recommend updating your browser to its latest version.

More info