Published May 1978 | Version v1
Journal article Metadata-only

13C- and proton-ENDOR studies of 13C-labelled organic radicals

Creators

  • 1. Freie Univ. Berlin (Germany, F.R.). Inst. fuer Molekuelphysik
  • 2. Freie Univ. Berlin (Germany, F.R.). Inst. fuer Organische Chemie
  • 3. Max-Planck-Institut fuer Medizinische Forschung, Heidelberg (Germany, F.R.)

Description

As part of a systematic non-proton ENDOR-in-solution study results are recorded for 13C in several isotopically enriched model compounds. Methods for synthesizing these labelled compounds are also presented. The optimum 13C ENDOR temperatures are found to be considerably higher than for protons on account of the larger hyperfine anisotropy. Cross relaxation effects are used to determine rotational correlation times. The isotropic 13C hyperfine couplings are in satisfactory agreement with INDO results. (orig.)

Abstract (German)

Als Teil einer systematischen nicht-protonischen ENDOR-Untersuchung in Loesungen werden Ergebnisse fuer 13C in mehreren Modellverbindungen mit angereicherten Isotopen angegeben. Die Methoden zur Synthetisierung dieser markierten Verbindungen werden ebenfalls beschrieben. Man findet eine im Vergleich mit Protonenexperimenten deutlich hoehere optimale 13C-ENDOR-Temperatur aufgrund der grossen Hyperfeinanisotropie. Kreuzrelaxationseffekte werden zur Bestimmung von Rotationskorrelationszeiten verwendet. Die Isotropen 13C-Hyperfeinkopplungen stimmen befriedigend mit INDO-Ergebnissen ueberein. (orig.)

Additional details

Identifiers

DOI
10.1515/zna-1978-0502;

Publishing Information

Journal Title
Zeitschrift für Naturforschung A
Journal Volume
33
Journal Issue
5
Series
Z. Naturforsch., A.
Journal Page Range
514-522
ISSN
1865-7109

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
9405633
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
ANISOTROPY; CARBON 13; ENDOR; HYPERFINE STRUCTURE; NUCLEAR MAGNETIC RESONANCE; ORGANIC COMPOUNDS; PROTONS; RADICALS; RELAXATION; TEMPERATURE DEPENDENCE
Descriptors DEC
BARYONS; CARBON ISOTOPES; CATIONS; CHARGED PARTICLES; ELEMENTARY PARTICLES; EVEN-ODD NUCLEI; FERMIONS; HADRONS; HYDROGEN IONS; HYDROGEN IONS 1 PLUS; IONS; ISOTOPES; LIGHT NUCLEI; MAGNETIC RESONANCE; NUCLEI; NUCLEONS; RESONANCE; STABLE ISOTOPES

Optional Information

Notes
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