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基于铀的 UO2(+)-Mn2+ 单链磁体通过阳离子-阳离子相互作用组装而成。

A uranium-based UO2(+)-Mn2+ single-chain magnet assembled trough cation-cation interactions.

机构信息

Laboratoire de Reconnaissance Ionique et Chimie de Coordination SCIB, UMR-E3 CEA-UJF, INAC, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 09 (France) http://inac.cea.fr/Pisp/51/marinella.mazzanti.html.

出版信息

Angew Chem Int Ed Engl. 2014 Jan 13;53(3):819-23. doi: 10.1002/anie.201307366. Epub 2013 Dec 6.

DOI:10.1002/anie.201307366
PMID:24311434
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4232274/
Abstract

Single-chain magnets (SCMs) are materials composed of magnetically isolated one-dimensional (1D) units exhibiting slow relaxation of magnetization. The occurrence of SCM behavior requires the fulfillment of stringent conditions for exchange and anisotropy interactions. Herein, we report the synthesis, the structure, and the magnetic characterization of the first actinide-containing SCM. The 5f-3d heterometallic 1D chains [{[UO2(salen)(py)]M(py)4}]n, (M=Cd (1) and M=Mn (2); py=pyridine) are assembled trough cation-cation interaction from the reaction of the uranyl(V) complex [UO2(salen)py][Cp2Co] (Cp=pentamethylcyclopentadienyl) with Cd(NO3)2 or Mn(NO3)2 in pyridine. The infinite UMn chain displays a high relaxation barrier of 134±0.8 K (93±0.5 cm(-1)), probably as a result of strong intra-chain magnetic interactions combined with the high Ising anisotropy of the uranyl(V) dioxo group. It also exhibits an open magnetic hysteresis loop at T<6 K, with an impressive coercive field of 3.4 T at 2 K.

摘要

单链磁体（SCMs）是由磁隔离的一维（1D）单元组成的材料，表现出磁化的缓慢弛豫。SCM 行为的发生需要满足交换和各向异性相互作用的严格条件。在此，我们报告了首例含锕系元素的 SCM 的合成、结构和磁性表征。5f-3d 异金属 1D 链 [{[UO2(salen)(py)]M(py)4}]n，（M=Cd(1)和 M=Mn(2)；py=吡啶）是通过反应 [UO2(salen)py][Cp2Co]（Cp=五甲基环戊二烯基）与 Cd(NO3)2 或 Mn(NO3)2 在吡啶中形成的阳离子-阳离子相互作用组装而成。无限长的 UMn 链显示出 134±0.8 K（93±0.5 cm(-1)）的高弛豫势垒，这可能是由于强的链内磁相互作用与铀酰(V)双氧基团的高 Ising 各向异性的结合所致。它还在 T<6 K 下表现出开放的磁滞回线，在 2 K 时具有令人印象深刻的 3.4 T 的矫顽场。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c9c3/4232274/6bc70cd2fe34/anie0053-0819-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c9c3/4232274/65a551d430b2/anie0053-0819-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c9c3/4232274/ed452c5133e2/anie0053-0819-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c9c3/4232274/2a6aa490bf24/anie0053-0819-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c9c3/4232274/8483f1759ad2/anie0053-0819-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c9c3/4232274/e73ca6e6eed8/anie0053-0819-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c9c3/4232274/6bc70cd2fe34/anie0053-0819-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c9c3/4232274/65a551d430b2/anie0053-0819-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c9c3/4232274/ed452c5133e2/anie0053-0819-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c9c3/4232274/2a6aa490bf24/anie0053-0819-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c9c3/4232274/8483f1759ad2/anie0053-0819-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c9c3/4232274/e73ca6e6eed8/anie0053-0819-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c9c3/4232274/6bc70cd2fe34/anie0053-0819-f5.jpg

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