高自旋铁磁分子团簇中的磁ocaloric效应。

IF 3.8 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Frontiers in Chemistry Pub Date : 2024-10-31 eCollection Date: 2024-01-01 DOI:10.3389/fchem.2024.1494609

Eleftheria Agapaki, Emmanouil K Charkiolakis, Gary S Nichol, David Gracia, Marco Evangelisti, Euan K Brechin

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引用次数: 0

摘要

MnCl2-4H2O 与 HL（(1-甲基-1H-咪唑-2-基)甲醇）和 pdH2（1, 3 丙二醇）在碱性 MeCN 溶液中反应，生成了一个混价 [Mn20] 阳离子簇和两个 [MnIICl4] 反阴离子。簇的金属骨架描述了两个几何上等价的混价链接[MnIII 6MnII 4]超四面体，其中最近邻的金属离子具有不同的氧化态。磁感应强度、磁化数据和热容量测量结果都支持铁磁相关性占主导地位的证据，从而导致[MnIII 6MnII 4]超四面体的 s = 22 自旋基态，它们通过微弱的反铁磁耦合成对相连。本文结合磁致效应和这种化合物在低温制冷中的潜在应用，对其性质进行了讨论。

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Magnetocaloric effect in a high-spin ferromagnetic molecular cluster.

The reaction of MnCl₂·4H₂O with HL ((1-methyl-1H-imidazol-2-yl)methanol) and pdH₂ (1, 3 propanediol) in a basic MeCN solution results in the formation of a mixed-valence [Mn₂₀] cationic cluster and two [Mn^IICl₄] counter anions. The metallic skeleton of the cluster describes two geometrically equivalent mixed-valent, linked [Mn^III ₆Mn^II ₄] supertetrahedra in which nearest-neighbor metal ions have a different oxidation state. Magnetic susceptibility, magnetization data and heat capacity measurements support evidence of predominant ferromagnetic correlations, leading to a s = 22 spin ground state for the [Mn^III ₆Mn^II ₄] supertetrahedra, which are pair-linked by a weak antiferromagnetic coupling. The properties are discussed in the context of the magnetocaloric effect and the potential application of this compound in cryogenic refrigeration.

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来源期刊

Frontiers in Chemistry Chemistry-General Chemistry

CiteScore

8.50

自引率

3.60%

发文量

1540

审稿时长

12 weeks

期刊介绍： Frontiers in Chemistry is a high visiblity and quality journal, publishing rigorously peer-reviewed research across the chemical sciences. Field Chief Editor Steve Suib at the University of Connecticut is supported by an outstanding Editorial Board of international researchers. This multidisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to academics, industry leaders and the public worldwide. Chemistry is a branch of science that is linked to all other main fields of research. The omnipresence of Chemistry is apparent in our everyday lives from the electronic devices that we all use to communicate, to foods we eat, to our health and well-being, to the different forms of energy that we use. While there are many subtopics and specialties of Chemistry, the fundamental link in all these areas is how atoms, ions, and molecules come together and come apart in what some have come to call the “dance of life”. All specialty sections of Frontiers in Chemistry are open-access with the goal of publishing outstanding research publications, review articles, commentaries, and ideas about various aspects of Chemistry. The past forms of publication often have specific subdisciplines, most commonly of analytical, inorganic, organic and physical chemistries, but these days those lines and boxes are quite blurry and the silos of those disciplines appear to be eroding. Chemistry is important to both fundamental and applied areas of research and manufacturing, and indeed the outlines of academic versus industrial research are also often artificial. Collaborative research across all specialty areas of Chemistry is highly encouraged and supported as we move forward. These are exciting times and the field of Chemistry is an important and significant contributor to our collective knowledge.