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用于表征顺磁性/自旋交叉配位络合物和金属有机笼的顺磁性核磁共振光谱工具箱

A Paramagnetic NMR Spectroscopy Toolbox for the Characterisation of Paramagnetic/Spin-Crossover Coordination Complexes and Metal-Organic Cages.

作者信息

Lehr Marc, Paschelke Tobias, Trumpf Eicke, Vogt Anna-Marlene, Näther Christian, Sönnichsen Frank D, McConnell Anna J

机构信息

Otto Diels Institute of Organic Chemistry, Christian-Albrechts-Universität zu Kiel, Otto-Hahn-Platz 4, Kiel, 24098, Germany.

Institute of Inorganic Chemistry, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, Kiel, 24118, Germany.

出版信息

Angew Chem Int Ed Engl. 2020 Oct 19;59(43):19344-19351. doi: 10.1002/anie.202008439. Epub 2020 Aug 26.

DOI:10.1002/anie.202008439
PMID:33448544
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7590057/
Abstract

The large paramagnetic shifts and short relaxation times resulting from the presence of a paramagnetic centre complicate NMR data acquisition and interpretation in solution. As a result, NMR analysis of paramagnetic complexes is limited in comparison to diamagnetic compounds and often relies on theoretical models. We report a toolbox of 1D (H, proton-coupled C, selective H-decoupling C, steady-state NOE) and 2D (COSY, NOESY, HMQC) paramagnetic NMR methods that enables unprecedented structural characterisation and in some cases, provides more structural information than would be observable for a diamagnetic analogue. We demonstrate the toolbox's broad versatility for fields from coordination chemistry and spin-crossover complexes to supramolecular chemistry through the characterisation of Co and high-spin Fe mononuclear complexes as well as a CoL cage.

摘要

顺磁中心的存在导致的大的顺磁位移和短的弛豫时间使溶液中的核磁共振(NMR)数据采集和解释变得复杂。因此,与抗磁性化合物相比,顺磁配合物的NMR分析受到限制,并且通常依赖于理论模型。我们报告了一个包含一维(氢、质子耦合碳、选择性氢去耦碳、稳态核Overhauser效应(NOE))和二维(化学位移相关谱(COSY)、核Overhauser效应谱(NOESY)、异核多量子相干谱(HMQC))顺磁NMR方法的工具箱,该工具箱能够实现前所未有的结构表征,并且在某些情况下,提供的结构信息比抗磁性类似物可观测到的更多。通过对钴和高自旋铁单核配合物以及一个钴配体笼的表征,我们展示了该工具箱在从配位化学、自旋交叉配合物到超分子化学等领域的广泛通用性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aff1/7590057/aa9023d9d31e/ANIE-59-19344-g005.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aff1/7590057/aa9023d9d31e/ANIE-59-19344-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aff1/7590057/9aa5cedd3ddb/ANIE-59-19344-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aff1/7590057/362ec1643ea3/ANIE-59-19344-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aff1/7590057/bcda6430107c/ANIE-59-19344-g003.jpg
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