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Issue 7, 2020
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Zn2Ln2 complexes with carbonate bridges formed by the fixation of carbon dioxide in the atmosphere: single-molecule magnet behaviour and magnetocaloric effect

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Abstract

Three novel isostructural Zn2Ln2 cluster complexes with carbonate bridging ligands, {Zn2Ln23-CO3)2L2(acacF6)2}·CH3OH [H2L = N,N′-dimethyl-N,N′-(2-hydroxy-3-methoxy-5-methyl-benzyl)ethylenediamine; HacacF6 = 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 Ln3+ 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 Ueff/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.

Graphical abstract: Zn2Ln2 complexes with carbonate bridges formed by the fixation of carbon dioxide in the atmosphere: single-molecule magnet behaviour and magnetocaloric effect

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Supplementary files

Article information


Submitted
21 Nov 2019
Accepted
15 Jan 2020
First published
15 Jan 2020

Dalton Trans., 2020,49, 2121-2128
Article type
Paper

Zn2Ln2 complexes with carbonate bridges formed by the fixation of carbon dioxide in the atmosphere: single-molecule magnet behaviour and magnetocaloric effect

C. Liu, D. Zhang, X. Hao and D. Zhu, Dalton Trans., 2020, 49, 2121
DOI: 10.1039/C9DT04480A

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