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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.
Dalton Transactions ( IF 4 ) Pub Date : 2020-01-29 , DOI: 10.1039/c9dt04480a
Cai-Ming Liu 1 , De-Qing Zhang , Xiang Hao , Dao-Ben Zhu
Affiliation  

Three novel isostructural Zn2Ln2 cluster complexes with carbonate bridging ligands, {Zn2Ln2(μ3-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.

中文翻译:

Zn2Ln2与碳酸盐桥的络合物,该碳酸盐桥由大气中二氧化碳的固定形成:单分子磁体行为和磁热效应。

三种新型的具有碳酸盐桥联配体的同构结构Zn2Ln2簇络合物,{Zn2Ln2(μ3-CO3)2L2(acacF6)2}·CH3OH [H2L = N,N'-二甲基-N,N'-(2-羟基-3-甲氧基- 5-甲基-苄基)乙二胺; HacacF6 =六氟乙酰丙酮; Ln = Dy,1; Ln = Gd,2; Ln = Eu,3],是通过将二氧化碳固定在大气中来制备的。此类碳酸盐桥联配体可介导Ln3 +离子之间的铁磁交换。Zn2Dy2化合物(1)具有单分子磁体(SMM)的特性,在1500 Oe dc磁场下显示缓慢的磁弛豫,相对于其他碳酸盐桥连的Zn2Dy2,Ueff / k值(83 K)明显更大SMM(≤34K)和ZnDy双核SMM,其衍生自用于这项工作的同一配体H2L(≤36.5K),
更新日期:2020-02-19
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