Abstract
Interaction of 2,2,6,6,-tetramethylpiperidine nitroxide free radical (AMPNO·) with 3d metal perchlorates, in the presence of triethyl orthoformate, leads to the formation of M(ClO 4) 2. TMPNO· (M = Co, Ni) and M(ClO 4) 2. 2TMPNO· (M = Fe, Zn) complexes. Characterization studies suggest that the new complexes are most probably bi- or poly-nuclear, with terminal TMPNO·, a bidentate perchlorato ligand, and a bridging perchlorato group. Magnetic susceptibility and esr data were interpreted in terms of partial spin-spin coupling between the unpaired ligand- and d-electrons, in the paramagnetic metal ion complexes; in the Zn II complex partial spin-spin coupling between the unpaired electrons of different ligand molecules occurs.
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