A hydroxyl-extended 1D dysprosium chain with two well-separated magnetic relaxation processes

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2025-10-09 DOI:10.1016/j.molstruc.2025.144303

Yan Li , Ya You , Fang-Zhi Li , Qi-Shu Zhong , Yi-Quan Zhang , En-Cui Yang

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引用次数: 0

Abstract

A 1D dysprosium chain {[Dy(CH₃OH)Cl₂(tpy)]·CH₃OH}_n (Htpy = 4′-(4-hydroxyphenyl)-2,2′:6′,2′'-terpyridine) that behaves as a single-ion magnet (SIM) and displays two well-separated relaxation processes with the zero-field effective energy barriers of 372.5 and 529.8 K, which represents the record thermal relaxation barrier among the reported one-dimensional Dy^III-based systems containing only one spin center. A magnetic hysteresis loop up to 6.0 K at a sweep rate of 200 Oe s^-1 is also observed. To explore the origin of these distinct relaxations, two crystallographically isostructural analogues including diamagnetic Y^III- (2) and Y^III-doped Dy_0.2Y_0.8 (3) were prepared and characterized structurally and magnetically. The persistence of bimodal peaks in the out-of-phase magnetic susceptibility (χ″) of diluted sample 3 indicates that the dual-step relaxation behavior primarily originates from the single-ion anisotropy of Dy^III ions. Structural analyses combined with XRD pattern comparisons pre- and post-magnetic measurements elucidated that the dual-step relaxation in complex 1 is related to partially desolvated samples. This work sheds light on the multiple relaxation mechanism and further provides important information for the development of high-performance SMMs.

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一个羟基延伸的一维镝链具有两个分离良好的磁弛豫过程

一维镝链{[Dy(CH3OH)Cl2(tpy)]·CH3OH}n （Htpy = 4′-（4-羟基苯基）-2,2′：6′，2′-三吡啶）表现为单离子磁体（SIM），表现出两个分离良好的弛豫过程，零场有效能垒分别为372.5 K和529.8 K，这是目前报道的仅含一个自旋中心的一维dyii基体系中记录的热弛豫势垒。在200 Oe s-1的扫描速率下，还观察到高达6.0 K的磁滞回线。为了探索这些不同弛豫的来源，制备了两种晶体结构类似物，包括抗磁性YIII-(2)和掺杂yii的Dy0.2Y0.8(3)，并对其结构和磁性进行了表征。稀释后样品3的非相磁化率（χ″）中双峰的持续存在表明，双步弛豫行为主要源于DyIII离子的单离子各向异性。结构分析结合磁前和磁后的XRD图谱比较表明，配合物1中的双步弛豫与部分脱溶样品有关。这项工作揭示了多重弛豫机制，为高性能smm的开发提供了重要的信息。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

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