Co3Gd4 cage as magnetic refrigerant and Co3Dy3 cage showing slow relaxation of magnetisation

Two structurally dissimilar 3d-4f cages having the formulae [(Co-III)(3)Gd-4(mu(3)-OH)(2)(CO3) ((O2CBu)-Bu-t)(11)(teaH)(3)]center dot 5H(2)O (1) and [(Co-III)(3)Dy-3(mu(3)-OH)(4)((O2CBu)-Bu-t)(6)(teaH)(3)]center dot(NO3)(2)center dot H2O (2) have been isolated under similar reaction conditions and s...

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Hauptverfasser:	Sheikh, Javeed Ahmad, Himanshu, Jena, Konar, Sanjit
Format:	Artikel
Sprache:	eng
Schlagworte:	Analytical Chemistry cages Chemistry Chemistry (miscellaneous) CLUSTERS COMPLEXES coordination cluster Drug Discovery FAMILY HIGH-NUCLEARITY HIGH-SPIN MOLECULES LIGAND magnetic refrigerant Molecular Medicine Organic Chemistry Pharmaceutical Science Physical and Theoretical Chemistry single molecular magnet SINGLE-MOLECULE MAGNETS
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Zusammenfassung:	Two structurally dissimilar 3d-4f cages having the formulae [(Co-III)(3)Gd-4(mu(3)-OH)(2)(CO3) ((O2CBu)-Bu-t)(11)(teaH)(3)]center dot 5H(2)O (1) and [(Co-III)(3)Dy-3(mu(3)-OH)(4)((O2CBu)-Bu-t)(6)(teaH)(3)]center dot(NO3)(2)center dot 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 (- increment S-m = 25.67 J kg(-1) K-1), and Co3Dy3 shows a single molecule magnet (SMM) behavior.
ISSN:	1420-3049 1420-3049