Dynamische Kernpolarisation in Lösungen von freien Radikalen in substituierten Pentafluorbenzolen / Dynamic nuclear polarisation in solutions of free radicals in substituted pentafluorobenzenes
Open Access
- 1 July 1974
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung A
- Vol. 29 (7) , 1071-1076
- https://doi.org/10.1515/zna-1974-0713
Abstract
Intermolecular scalar hyperfine coupling between unpaired electron orbitals and 19F nuclei has been studied in solutions of free radicals in substituted pentafluorobenzenes. Dynamic nuclear polarisation experiments in a weak magnetic field and at various temperatures have shown that both the strength of the intermolecular interaction and the range, depend sensitively upon the π-electron distribution of the aromatic system. The amount of scalar coupling increases with substitution in the sequence H, CH3 , J, Br, CI, F, CN and with the kind of radicals in the order TTBP, DPPH and BDPA.Keywords
This publication has 0 references indexed in Scilit: