从 MnIII 配位复合物的太赫兹 EPR 中的磁场诱导扭转中获益

IF 1.1 4区 物理与天体物理 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL
Thierry Dubroca, Andrew Ozarowski, Yukinari Sunatsuki, Joshua Telser, Stephen Hill, J. Krzystek
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引用次数: 0

摘要

锰(III)(3d4,S = 2)配位配合物因其本身固有的化学性质以及为新兴的分子磁学领域提供信息而受到高频场 EPR(HFEPR)的广泛研究。在本研究中,我们展示了一种稳定、易于处理的 MnIII 复合物 [MnLKNO3](其中 L3- 是六价三元配体,1,1,1-三[(3-甲氧基水杨酰亚氨基)甲基]乙烷的三元离子)如何完全用于另一个目的。该标准优于 "传统 "标准,如有机自由基(如 DPPH)的单一 g = 2.00 信号,或原子氢,后者不如 DPPH 容易获得,且仅提供两个信号用于校准目的(Stoll 等人,J Magn Reson 207:158-163, 2010 年)。相比之下,多晶[MnLKNO3](1)在 HFEPR 光谱仪的外部磁场中定向(本研究使用了三种不同的光谱仪)。通过 1 的晶体结构,可以确定 1 在外加磁场中精确、可重复的分子取向。这种现象可在较宽的磁场扫描范围(0-36 T)内的任意频率(迄今为止已测试到 1 THz)上产生多个定义明确的共振,从而在多频率 HFEPR 研究中准确校准磁场。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Benefitting from Magnetic Field-Induced Torquing in Terahertz EPR of a MnIII Coordination Complex

Benefitting from Magnetic Field-Induced Torquing in Terahertz EPR of a MnIII Coordination Complex

Manganese(III) (3d4, S = 2) coordination complexes have been widely studied by high-frequency and -field EPR (HFEPR) for their own inherent chemical interest and for providing information for the burgeoning area of molecular magnetism. In the present study, we demonstrate how a stable, easily handled complex of MnIII, [MnLKNO3], where L3− is a hexadentate tripodal ligand, trianion of 1,1,1-tris[(3- methoxysalicylideneamino)methyl]ethane, can be used for another purpose entirely. This purpose is as a field and frequency standard for HFEPR that is superior to a “traditional” standard such as an organic radical (e.g., DPPH) with its single, g = 2.00 signal, or to atomic hydrogen, which is less readily available than DPPH and provides only two signals for calibration purposes (Stoll et al. in J Magn Reson 207:158–163, 2010). By contrast, polycrystalline [MnLKNO3] (1) orients in the external magnetic field of an HFEPR spectrometer (three different spectrometers were employed in this study). The crystal structure of 1 allows determination of the exact, reproducible molecular orientation of 1 in the applied field. This phenomenon provides multiple, well-defined resonances over a broad field sweep range (0–36 T) at any of a wide range of frequencies (tested up to 1 THz so far) allowing accurate calibration of magnetic field in a multi-frequency HFEPR study.

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来源期刊
Applied Magnetic Resonance
Applied Magnetic Resonance 物理-光谱学
CiteScore
1.90
自引率
10.00%
发文量
59
审稿时长
2.3 months
期刊介绍: Applied Magnetic Resonance provides an international forum for the application of magnetic resonance in physics, chemistry, biology, medicine, geochemistry, ecology, engineering, and related fields. The contents include articles with a strong emphasis on new applications, and on new experimental methods. Additional features include book reviews and Letters to the Editor.
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