SMM features of a large lanthanide family of butterfly Cr III2Ln III2 pivalate complexes (Ln = Gd, Tb, Dy, Ho, Er, Tm and Yb)†

IF 3.3 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR Dalton Transactions Pub Date : 2024-07-05 DOI:10.1039/D4DT01492H

Daiana Cabrosi, Juan H. Mecchia Ortiz, Luca M. Carrella, Eva Rentschler and Pablo Alborés

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Abstract

In this work we report the synthesis, structural characterization and magnetic properties of a family of butterfly complexes {Cr₂Ln₂} with Ln = Tb (4), Ho (5), Er (6), Tm (7) and Yb (8), extending the family of previously reported isostructural compounds with Gd (1), Dy (2) and Y (3). As in 1 and 2, an anti-ferromagnetic Cr(III)–Ln(III) exchange interaction is found. For oblate ions 4 and 5, SMM behavior with a purely Orbach relaxation mechanism is observed with thermal barriers of 38 cm⁻¹ (4) and 32 cm⁻¹ (5). Complex 4 displays hysteresis opening up to 2.4 K with loss of magnetization at zero field. The prolate complex ions 6 and 7 are field-induced SMM's with dominant Orbach, direct and QTM relaxation mechanisms. Compound 8 did not show SMM properties.

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大型镧系元素蝶形 CrIII2LnIII2 新戊酸盐配合物（Ln = Gd、Tb、Dy、Ho、Er、Tm 和 Yb）的 SMM 特征。

在这项工作中，我们报告了 Ln = Tb (4)、Ho (5)、Er (6)、Tm (7) 和 Yb (8) 的蝶形配合物 {Cr2Ln2} 家族的合成、结构表征和磁性能，扩展了之前报告的 Gd (1)、Dy (2) 和 Y (3) 等结构化合物家族。与 1 和 2 一样，发现了反铁磁性 Cr(III)-Ln(III) 交换相互作用。对于扁圆形离子 4 和 5，可观察到具有纯奥尔巴赫弛豫机制的 SMM 行为，热障分别为 38 cm-1 (4) 和 32 cm-1 (5)。配合物 4 显示出磁滞开度高达 2.4 K，在零磁场时磁化消失。6 和 7 是场诱导的 SMM，具有主要的 Orbach、直接和 QTM 松弛机制。化合物 8 没有显示出 SMM 特性。

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

Dalton Transactions 化学-无机化学与核化学

CiteScore

6.60

自引率

7.50%

发文量

1832

审稿时长

1.5 months

期刊介绍： Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.