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A simple route to a 1D ferromagnetic Dy-containing compound showing magnetic relaxation behaviour

机译：显示一维铁磁含Dy化合物的简单途径

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摘要

Two well-isolated rare earth ion-based one-dimensional (1D) compounds with the general formulae [RE(3,5-DNBz)(3)(H2O)(2)](H2O) (RE = Y(1) and Dy(2); 3,5-DNBz = 3,5-dinitrobenzoic acid) have been assembled under hydrothermal conditions with the bulky ligand 3,5-DNBz and structurally characterized by single-crystal X-ray diffraction, IR, TG-DTA, and elemental analysis. 1 and 2 are isostructural and possess a chain structure bridged alternatively by double and quadruple carboxylic groups of the 3,5-DNBz anions. For 2, the rare earth ion center surrounded by six 3,5-DNBz anions and two water molecules is in an intermediate coordination geometry between the ideal square anti-prism (SAP) and bicapped trigonal prism (BTP). Magnetic investigation using direct-current (dc) measurement revealed weak ferromagnetic intra-chain interaction in the Dy analogue 2. In the alternating-current (ac) susceptibility measurements, 2 was revealed dominating quantum tunnelling relaxation under zero dc field, while it exhibited the coexistence of quantum tunnelling and thermal activated relaxations (with an energy barrier U-eff/k of 77.8 K) in 300 Oe dc field, and the quenching of quantum tunnelling and an almost pure thermal magnetic relaxation (U-eff/k = 90.9 K) in 2 kOe dc field.
机译：具有通式[RE（3,5-DNBz）（3）（H2O）（2）]（H2O）的两种完全隔离的基于稀土离子的一维（1D）化合物（RE = Y（1）和Dy（2）; 3,5-DNBz = 3,5-二硝基苯甲酸）已在水热条件下与庞大的配体3,5-DNBz组装并通过单晶X射线衍射，IR，TG-DTA进行结构表征以及元素分析。 1和2是同构的，并且具有被3，5-DNBz阴离子的双和四羧基交替地桥接的链结构。对于2，稀土离子中心被六个3,5-DNBz阴离子和两个水分子包围，处于理想的方形反棱镜（SAP）和二阶三棱柱（BTP）之间的中间配位几何结构。使用直流（dc）测量的磁性研究显示Dy模拟物2中弱的铁磁性链内相互作用。在交流（ac）磁化率测量中，有2显示在零dc场下占主导地位的量子隧穿弛豫，而它却表现出在300 Oe dc场中同时存在量子隧穿和热活化弛豫（能垒U-eff / k为77.8 K），以及量子隧穿的淬灭和几乎纯的热磁弛豫（U-eff / k = 90.9 K） ）在2 kOe直流场中。

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