The Ferromagnetic Coupling Mechanism in Hetallocenium/π-Anion Stacks as seen by NMR Spectroscopy
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The 1H and 13C NMR spectra of selected nickelocenium, chromocenium, and ferrocenium ions are reported. The sign of the signal shifts establishes positive or negative electron spin on the ligand for Ni or Cr sandwiches, respectively. Hyperconjugative spin transfer to β carbon atoms of substituted ferrocenium ions is used to prove negative spin on their ligands. For (Cp )Cr(arene) derivatives negative spin on the ligand is indicated by characteristic shifts of the β-proton signals. The results meet the requirements of the mechanism of Kahn and Kollmar 5b c for magnetic intra-stack interactions. © 1993, Taylor & Francis Group, LLC. All rights reserved.
author list (cited authors)
Blümel, J., Hebendanz, N., Hudeczek, P., Köhler, F. H., Steck, A., & Strauss, W.