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This chapter gives an overview of the different available techniques to probe the electronic properties of transition metal complexes or metalloproteins, and focuses on the determination of the spin (and oxidation) state of the metal center. It concentrates on the most appropriate and common techniques to address this issue, including magnetic susceptibility and magnetization measurements, electron...
This chapter gives an overview of the different spin‐state crossing scenarios affecting the reactivity of organometallic compounds. It focuses on the effects of crossing spin states in a number of elementary reactions typically observed for organometallic compounds, such as ligand exchange, oxidative addition, reductive elimination, migration/insertion, β‐hydride elimination, C‐H bond activation and...
Organometallic and bioinorganic chemical reactions involve transition metal complexes, which often possess several unpaired electrons on the metal center, giving rise to closely lying spin states, which may participate in reactivity. This chapter focuses on describing these concepts, and on showing that unpaired electrons and multi‐state situations have a profound impact on chemical reactivity. It...
This chapter provides a comprehensive review of the role of spin states in determining the reactivity of biological and chemical catalysts that employ non‐innocent ligands. It presents a survey of the commonly known non‐innocent ligands in chemistry and biology and the various analytical methods that can be used for their identification. In recent years, electron paramagnetic resonance (EPR), Mossbauer,...
This chapter illustrates the utility of nuclear magnetic resonance (NMR) for the study of spin density distribution in molecules containing paramagnetic transition metal ions. The focus on transition metal‐containing molecules comes from the importance of spin in their reactivity as well as their amenability in many cases to detailed study by NMR. This chapter first provides background on the effects...
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