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Published July 1, 1970 | public
Journal Article

Nuclear Magnetic Resonance Spectroscopy. Observation of Carbon-13 Resonances in a Paramagnetic Transition Metal Complex. Nickel(II) N,N'-di(p-tolyl)aminotroponiminate

Abstract

The discovery of the extraordinary chemical shifts of the proton magnetic resonances of paramagnetic Ni(II) aminotroponiminates has been of great value for probing the nature of metal-ligand bonding especially because sharp resonances are observed as the result of the short electronic relaxation times of the tetrahedral forms which are associated with the squareplanar (diamagnetic) ⇌ tetrahedral (paramagnetic) equilibria. These complexes are expected to provide a useful starting point for natural-abundance nmr studies of paramagnetic transition metal complexes. We report in this study observation of eight of the possible nine carbon resonances of the N,N'-di(ptolyl) derivative 1, and present evidence for nonzero spin density in the σ framework of the ligand.

Additional Information

© 1970 American Chemical Society. Received March 30, 1970. Supported by the National Science Foundation and by the Public Health Service (Grant No. 11072), Division of Research Grants, National Institutes of Health. We are indebted to Dr. R. E. Benson of the Central Research Department of E. I. du Pont de Nemours and Company for samples of the ligand and complex and the reviewers for their helpful comments.

Additional details

Created:
August 19, 2023
Modified:
October 24, 2023