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Isotropic NMR Shifts in Paramagnetic Cobalt and Nickel Phosphine Complexes

  • William DeW. HorrocksJr.
  • Gerd N. LaMar
Conference paper

Abstract

The conditions necessary for observation of proton magnetic resonance spectra in paramagnetic systems are well established (1). Either the electronic spin-lattice relaxation time, T1, or a characteristic electronic exchange time, Te, must be short compared with the isotropic hyperfine contact interaction constant, Ai, in order for resonances to be observed. Proton resonances in paramagnetic systems are often shifted hundreds of cps from their values in the diamagnetic substances. These isotropic resonance shifts may arise from two causes, the hyperfine contact and pseudocontact interactions. The contact shift arises from the existence of unpaired spin -density at the resonating nucleus and is described by ·1} (2) for systems obeying the Curie law, (math)

Keywords

Nickel Complex Para Hydrogen Unpaired Spin Ortho Hydrogen Pseudocontact Shift 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Wien 1964

Authors and Affiliations

  • William DeW. HorrocksJr.
    • 1
  • Gerd N. LaMar
    • 1
  1. 1.Department of ChemistryPrinceton UniversityPrincetonUSA

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