Co3Gd4 Cage as Magnetic Refrigerant and Co3Dy3 Cage Showing Slow Relaxation of Magnetisation
2022
Javeed Ahmad Sheikh | Himanshu Sekhar Jena | Sanjit Konar
Two structurally dissimilar 3d-4f cages having the formulae [(CoIII)3Gd4(&mu:3-OH)2(CO3) (O2CtBu)11(teaH)3]·:5H2O (1) and [(CoIII)3Dy3(&mu:3-OH)4(O2CtBu)6(teaH)3]·:(NO3)2·:H2O (2) have been isolated under similar reaction conditions and stoichiometry of the reactants. The most important factor for structural diversity seems to be the incorporation of one &mu:3-carbonate anion in 1 and not in 2. Co atoms are in a +3 oxidation state in both complexes, as shown by the Bond Valence Sum (BVS) calculations and bond lengths, and as further supported by magnetic measurements. Co3Gd4 displays a significant magnetocaloric effect (&minus:∆:Sm = 25.67 J kg&minus:1 K&minus:1), and Co3Dy3 shows a single molecule magnet (SMM) behavior.
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