Abstract

It is shown by EPR and magnetic susceptibility (χ) measurements that acetate-N-methyl-octaethylporphyrinato-Co(II) has a high-spin ground state. The complex in toluene gives EPR spectra with g= 4.4 and 2.04 and χ with μ eff= 4.4 BM and D ≈ 20 cm −1, which indicates square-pyramidal geometry around Co (II). Data for the undiluted system are analyzed in terms of a dimer model with a small exchange interaction.

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