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使用激进束衣来强制执行超短的Dy-Dy距离,从而在Dy^III₂中增强双极相互作用

Anthony B Carter^1,2, Jonas Braun^1,3,4, Tilmann Bodenstein^3,5,6

¹Institute for Inorganic Chemistry (AOC), Karlsruhe Institute of Technology (KIT), Kaiserstr. 12, Karlsruhe 76131, Germany.

Inorganic chemistry

|December 15, 2025

概括

我们合成了含有新型基因的兰坦化物化合物. 这些化合物表现出缓慢的磁放松,内部磁场防止零场量子道化磁化 (ZFQTM).

科学领域:

协调化学协调化学
磁电化学磁电化学磁电化学
材料科学材料科学材料科学

背景情况:

基于兰化物的单分子磁铁 (SMM) 对于开发先进的磁性材料至关重要.
控制磁放松和量子道现象是SMM性能的关键.
激素连接体可以调解金属中心之间的强磁相互作用.

研究的目的:

合成和表征新型含有空气稳定基的兰坦化物化合物.
为了研究磁性特性,特别是缓慢的磁放松和量子道.
阐明分子内相互作用和内部磁场对磁放松动态的作用.

主要方法:

化物复合物的合成与9,10-phenanthrenesemiquinone (phsq) 连接物.
磁感应度测量 (dc和ac) 用于研究磁性行为.
Ab initio计算以确定电子结构和内部磁场.
使用多种理论模型分析磁性数据.

主要成果:

合成了三种含有空气稳定基的化合物,[M^III₂(phsq) ₄(NO₃) ₂(MeOH) ₂·2MeOH (M = Dy, Y, Gd),这些化合物都具有空气稳定性.
含有Dy的化合物 (1) 显示出单分子磁铁的行为,其放松度高达18K.
最初的计算揭示了显著的内部磁场,可以抑制磁化 (ZFQTM) 的零场量子道.
对Dy-Y合样本的测量证实了在没有这些内部场的情况下存在强大的ZFQTM.

结论:

强烈的分子内根间相互作用有效地隔离了兰化物离子.
在Dy复合体内的内部磁场灭ZFQTM,提高SMM性能.
这种Y-doped样本为纯Dy化合物中抑制ZFQTM的机制提供了关键证据.

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