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Chemically Induced Dynamic Nuclear and Electron Polarizations-CIDNP and CIDEP

  • Claude Richard
  • Pierre Granger
Conference proceedings

Table of contents

  1. Front Matter
    Pages i-3
  2. Claude Richard, Pierre Granger
    Pages 5-5
  3. Claude Richard, Pierre Granger
    Pages 7-22
  4. Claude Richard, Pierre Granger
    Pages 23-73
  5. Claude Richard, Pierre Granger
    Pages 107-115
  6. Back Matter
    Pages 117-130

About these proceedings

Introduction

Anomalous electron-spin state populations in the Electron Paramagnetic Re­ sonance (EPR) spectra of radicals formed during radio lysis experiments were observed in 1963 by FESSENDEN and SCHULER [170a]. This phenomenon did not receive much attention at the time. In 1967, BARGON, FISCHER, and JOHNSEN [5] and independently WARD and LAWLER [7,8] reported a similar phenomenon for Nuclear Magnetic Resonance (NMR) spectra taken during radical reactions: emission or enhanced absorption, or both. The earliest attempts to explain this new NMR phenomenon treated these effects in a way similar to that of Dynamic Nuclear Polarization (DNP) or the Overhauser effect. Although the polarization has a completely different origin, DNP gave its name to this effect: Chemically Induced Dynamic Nuclear Polariza­ tion (CIDNP). [The name Chemically Induced Dynamic Electron Polarization (CIDEP) was introduced later by analogy with CIDNP]. After the initial publica­ tions, all the new data demonstrated that the first theory could not be correct. In 1969, a new theory was proposed by CLOSS [18] and independently by KAPTEIN and OOSTERHOFF [23] and called the radical-pair theory. This mechanism was proposed to account for the observations of polarization in both NMR and EPR. The radical-pair theory is based on weak interactions in a pair of radicals: the strength of interaction between the electronic states of the radicals depends in particular on the nuclear-spin states.

Keywords

Absorption Atom Diffusion Elektronenpolarisation Kernpolarisation NMR Nuclear Nuclear Polarizations Sorption Substitution chemical reaction isotope kinetics nuclear magnetic resonance rearrangement

Authors and affiliations

  • Claude Richard
    • 1
  • Pierre Granger
    • 2
  1. 1.Laboratoire de Chimie RadicalaireEquipe de Recherche N° 136 associée au C.N.R.SNancy CedexFrance
  2. 2.Laboratoire de Chimie ThéoriqueUniversité de Nancy INancy CedexFrance

Bibliographic information

  • DOI https://doi.org/10.1007/978-3-642-65793-1
  • Copyright Information Springer-Verlag Berlin Heidelberg 1974
  • Publisher Name Springer, Berlin, Heidelberg
  • eBook Packages Springer Book Archive
  • Print ISBN 978-3-642-65795-5
  • Online ISBN 978-3-642-65793-1
  • Series Print ISSN 0170-5989
  • Buy this book on publisher's site