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Title

Decanuclear Ln10 wheels and vertex-shared spirocyclic Ln5 cores: synthesis, structure, SMM behavior, and MCE properties

AuthorsTitos-Padilla, Silvia; Lorusso, Giulia; Evangelisti, Marco; Colacio, Enrique; Chandrasekhar, Vadapalli
KeywordsX-ray diffraction
Macrocycles
Ligands
Lanthanide complexes
Magnetic properties
Issue Date2015
PublisherWiley-VCH
CitationChemistry - A European Journal 21(47): 16955-16967 (2015)
AbstractThe reaction of a Schiff base ligand (LH3) with lanthanide salts, pivalic acid and triethylamine in 1:1:1:3 and 4:5:8:20 stoichiometric ratios results in the formation of decanuclear Ln10 (Ln=Dy(1), Tb(2), and Gd (3)) and pentanuclear Ln5 complexes (Ln=Gd (4), Tb (5), and Dy (6)), respectively. The formation of Ln10 and Ln5 complexes are fully governed by the stoichiometry of the reagents used. Detailed magnetic studies on these complexes (1–6) have been carried out. Complex 1 shows a SMM behavior with an effective energy barrier for the reversal of the magnetization (Ueff)=16.12(8) K and relaxation time (τo)=3.3×10−5 s under 4000 Oe direct current (dc) field. Complex 6 shows the frequency dependent maxima in the out-of-phase signal under zero dc field, without achieving maxima above 2 K. Complexes 3 and 4 show a large magnetocaloric effect with the following characteristic values: −ΔSm=26.6 J kg−1 K−1 at T=2.2 K for 3 and −ΔSm=27.1 J kg−1 K−1 at T=2.4 K for 4, both for an applied field change of 7 T.
Descriptionet al.
Publisher version (URL)https://doi.org/10.1002/chem.201501992
URIhttp://hdl.handle.net/10261/147619
DOI10.1002/chem.201501992
Identifiersdoi: 10.1002/chem.201501992
e-issn: 1521-3765
issn: 0947-6539
Appears in Collections:(ICMA) Artículos
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