Journal
DALTON TRANSACTIONS
Volume 49, Issue 7, Pages 2121-2128Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9dt04480a
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Funding
- National Natural Science Foundation of China [21871274, 21471154, 11774178]
- National Key Basic Research Program of China [2013CB933403]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB12010103]
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Three novel isostructural Zn(2)Ln(2) cluster complexes with carbonate bridging ligands, {Zn(2)Ln(2)(mu(3)-CO3)(2)L-2(acacF(6))(2)}CH3OH [H2L = N,N '-dimethyl-N,N '-(2-hydroxy-3-methoxy-5-methyl-benzyl)ethylenediamine; HacacF(6) = hexafluoroacetylacetone; Ln = Dy, 1; Ln = Gd, 2; Ln = Eu, 3], have been prepared by fixing carbon dioxide in the atmosphere. Such carbonate bridging ligands may mediate ferromagnetic exchange between Ln(3+) ions. The Zn2Dy2 compound (1) displays the properties of a single molecule magnet (SMM), showing slow magnetic relaxation at a 1500 Oe dc field, with an obviously larger U-eff/k value (83 K) with respect to the other carbonate-bridged Zn2Dy2 SMMs (<= 34 K) and ZnDy dinuclear SMMs derived from the same ligand H2L used in this work (<= 36.5 K), while the Zn2Gd2 compound (2) shows a moderate magnetocaloric effect and can be looked upon as a potential molecular material for low temperature magnetic refrigeration.
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