1986 Volume 59 Issue 2 Pages 617-620
The title paramagnetic cobalt(III) complexes, (Remark: Graphics omitted.),(X3: Cl2·NO3, (NO3)3), both green color, have been isolated and characterized by analytical, spectroscopic and magnetic methods. The effective magnetic moments are 1.7 BM, suggesting an unpaired spin. The 1H NMR spectra indicate that the unpaired spin on the complexes is localized over the π-orbitals of the chelated ligand. In the XPS, the high binding energy area at 286–289 eV of the C ls peak of both the complexe is larger than that for the corresponding diamagnetic cobalt(III) complex. The cobalt 2p peaks do not have satellites in the same manner as the usual diamagnetic cobalt(III) complexes. It can be concluded that an unpaired spin on complexes is not located on the cobalt atom, but is located over the π-orbitals of the chelated ligand of complexes.
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