Abstract
The synthesis and characterization of some new binuclear copper (II) complexes, based on the use of large, pyrole-containing macrocycles, the so called expanded porphyrins, [Cu2(macrocycle)]+4 is described. Electron Spin Resonance (ESR) studies indicate a weak half-field line, which is characteristic of the Cu(II)-Cu(II) dimer, is observed at about 1600G. The observation of this band strongly suggests that the hyperfine structure arises from a spin triplet species.
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