Department of Chemistry, University of Rochester, Rochester, New York 14627, USA.
Dalton Trans. 2021 Jan 14;50(2):416-428. doi: 10.1039/d0dt03730c. Epub 2020 Dec 14.
Magnetic circular dichroism (MCD) spectroscopy is a powerful experiment used to probe the electronic structure and bonding in paramagnetic metal-based complexes. While C-term MCD spectroscopy has been utilized in many areas of chemistry, it has been underutilized in studying paramagnetic organometallic transition metal and f-element complexes. From the analysis of isolated organometallic complexes to the study of in situ generated species, MCD can provide information regarding ligand interactions, oxidation and spin state, and geometry and coordination environment of paramagnetic species. The pratical aspects of this technique, such as air-free sample preparation and cryogenic experimental temperatures, allow for the study of highly unstable species, something that is often difficult with other spectroscopic techniques. This perspective highlights MCD studies of both transition metal and f-element organometallic complexes, including in situ generated reactive intermediates, to demonstrate the utility of this technique in probing electronic structure, bonding and mechanism in paramagnetic organometallic chemistry.
磁圆二色性（MCD）光谱学是一种强大的实验方法，用于探测顺磁金属基配合物的电子结构和键合。虽然 C 端 MCD 光谱学已在化学的许多领域得到了应用，但在研究顺磁有机金属过渡金属和 f 族元素配合物方面的应用还不够充分。从对分离的有机金属配合物的分析到对原位生成物种的研究，MCD 可以提供有关配体相互作用、氧化态和自旋态以及顺磁物种的几何形状和配位环境的信息。该技术的实际方面，例如无空气样品制备和低温实验温度，允许研究高度不稳定的物种，这在其他光谱技术中通常是困难的。本观点重点介绍了过渡金属和 f 族元素有机金属配合物的 MCD 研究，包括原位生成的反应中间体，以证明该技术在探测顺磁有机金属化学中的电子结构、键合和机制方面的实用性。
