Experimental estimation of the interaction parameter e0 for Zn-N

Abstract

Low-temperature single-crystal ESR studies of bis(ω-nitroacetophenonato)bis(4-methylpyridine)Cu(II), diluted in the corresponding Zn(II) complex, are reported. The g tensor, the metal hyperfine and quadrupole coupling tensors, and the nitrogen hyperfine coupling tensors have been obtained. The measured magnetic parameters are strongly affected by the presence of low-symmetry ligand field components. The along-the-bonds orientation of the in-plane g components and the low anisotropy of the copper hyperfine tensor are interpreted in terms of this effect. The calculation of the covalency parameters by means of the conventional LCAO-MO approach, based on metal hyperfine data, is shown to give unreliable results in this case.