An ESR Study of 5-Formazanyl Copper(II) Complexes as an Analogy to Three of Copper-Containing Proteins

Article abstract of DOI:10.1246/bcsj.61.181

The Electron Spin Resonance(ESR) spectra of ten 5-formazanyl copper(II) complexes in toluene solutions have been observed at room temperature and at that of liquidnitrogen.The ESR(g<*> and A<*>) and bonding (α²) parameters of the copper ion were greatly affected by substituting several groups at the ortho position of 1-phenyl ring of formazan.Based on these results, the complexes are classified into three groups: Group I, in which A<*> ca. 0.012-0.013 cm^-1 and α² ca. 0.5; Group II, in which A<*> ca. 0.017 cm^-1 and α² ca. 0.7, and Group III, in which two copper ions are interacting.It is clarified that they correspond nicely to three types of copper-containing proteins previously investigated.