A Paramagnetic NMR Spectroscopy Toolbox for the Characterisation of Paramagnetic/Spin‐Crossover Coordination Complexes and Metal–Organic Cages
作者:Marc Lehr、Tobias Paschelke、Eicke Trumpf、Anna‐Marlene Vogt、Christian Näther、Frank D. Sönnichsen、Anna J. McConnell
DOI:10.1002/anie.202008439
日期:2020.10.19
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 (1H, proton‐coupled 13C, selective 1H‐decoupling 13C, steady‐state
由于存在顺磁性中心而导致的大顺磁性位移和短弛豫时间使溶液中的NMR数据采集和解释复杂化。结果,与抗磁性化合物相比,顺磁性配合物的NMR分析受到限制,并且通常依赖于理论模型。我们报告了1D(1 H,质子耦合13 C,选择性1 H去耦13C,稳态NOE)和2D(COSY,NOESY,HMQC)顺磁NMR方法可实现空前的结构表征,在某些情况下,其提供的结构信息比抗磁类似物所能观察到的更多。我们通过表征Co II和高自旋Fe II单核配合物以及Co 4 L 6笼,证明了该工具箱在从配位化学和自旋交联配合物到超分子化学领域的广泛用途。