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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1973 Mar;70(3):939–940. doi: 10.1073/pnas.70.3.939

Nuclear Magnetic Resonance Shift Reagents: Evidence for Different Mechanisms of Contact Contributions to 13C Shifts Induced by Nickel and Cobalt Acetylacetonates with Saturated Amines and Alcohols

S R Johns 1, Robert A Smith 1, Geoffrey E Hawkes 1, John D Roberts 1
PMCID: PMC433392  PMID: 16592073

Abstract

The pattern of 13C and 1H nuclear magnetic resonance (NMR) shift changes produced by complexation of cobalt and nickel acetylacetonates with amines and alcohols indicates that there is more than one mode of operation of the contact interaction. A large effect with alternating signs is important at the α and β carbons, but this effect seems to be overlaid by another influence that appears to fall off monotonically as one proceeds away from the site of complexation.

Keywords: complexes, spin polarization, α-carbon shifts, β-carbon shifts

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Marzin C., Leibfritz D., Hawkes G. E., Roberts J. D. Nuclear Magnetic Resonance Shift Reagents: Abnormal C Shifts Produced by Complexation of Lanthanide Chelates with Saturated Amines and n-Butyl Isocyanide. Proc Natl Acad Sci U S A. 1973 Feb;70(2):562–563. doi: 10.1073/pnas.70.2.562. [DOI] [PMC free article] [PubMed] [Google Scholar]

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