Principal crystal and molecular paramagnetic susceptibilities of bis-(N-isopropylsalicylideneiminato)nickel(II)

Abstract

Principal crystal paramagnetic susceptibilities of the title complex throughout the range 20–295 K are reported. A new compact Faraday balance for the measurement of crystal magnetic properties in this temperature range is described. The experimental susceptibilities, together with the crystal transmission spectrum, have been fitted by a quantum-mechanical model in which no fictitious symmetry higher than shown in the true molecular geometry is presumed. The ligand field is parameterized by the angular-overlap model. Parameter values for σ and π bonding and for spin–orbit and orbital-reduction effects have been determined which reproduce the experimental susceptibilities to within ±2% throughout the temperature range. The calculated orientations of the principal molecular susceptibilities are compared with the co-ordination geometry of the complex.