Principal crystal and molecular paramagnetic susceptibilities of bis(5-chloro-N-β-diethylaminoethylsalicylideneiminato)nickel(II)

Abstract

The principal crystal susceptibilities of the five-co-ordinate title complex have been measured in the range 20–300 K by the Faraday technique. Complete sets of values for χ₁, χ₂, and χ_b, the principal susceptibilities of the monoclinic crystals, have been obtained, together with representative values of the susceptibility parallel to a′. the normal of b and c, from which the value of ϕ, the angle subtended by χ₁ and a, was determined. The crystal susceptibilities have been fitted by calculations within a complete d⁸ basis, using the angular-overlap model (a.o.m.) to represent the ligand field. Values for the a.o.m. parameters as well as those for spin–orbit coupling and orbital-reduction factors are critically compared with those recently obtained for the closely similar four-co-ordinate complex, bis(N-isopropylsalicylideneiminato)nickel(II). It is suggested that the present study furnishes some evidence that current techniques in magnetochemistry may reveal mesomeric effects separate from inductive ones. The orientation of the molecular magnetic ellipsoid with respect to the square-pyramidal type molecular geometry is calculated and discussed.