Abstract
The stable free radicals, the isomers of 4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide with the 2-substituentR (R=para-,meta-,ortho-pyridyl), have been prepared and used as ligands in copper(II), palladium(II) and platinum(II) complexes. The magnetic moments and the EPR spectra of the complexes and the free radicals have been investigated. Most of the complexes show a considerable intramolecular interaction between the radicalic groups of the ligands. No intramolecular interaction was found, however, between the transition metal ions and the unpaired electrons of the ligands. But by analysis of the EPR spectra in the solid state there was found in some cases an intermolecular interaction between the metal ion [copper(II)] and the unpaired electrons of the ligands.
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Schwarzhans, K.E., Stuefer, A. Übergangsmetallkomplexe mit Nitronylnitroxylradikalliganden. Monatsh Chem 114, 137–144 (1983). https://doi.org/10.1007/BF00798318
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DOI: https://doi.org/10.1007/BF00798318