Single-crystal magnetic properties of lanthanide complexes. Part IX. Hexakis(antipyrine)dysprosium(III) tri-iodide

Abstract

The principal and average magnetic moments of hexakis(antipyrine)dysprosium(III) tri-iodide (antipyrine is 2,3-dimethyl-1-phenyl-Δ³-pyrazolin-5-one) have been measured in the temperature range 80—300 K. The results are interpreted within a point-charge crystal-field model incorporating the D_3d symmetry of these six-co-ordinate complexes. Calculations are performed within the ⁶H_15/2+⁶H_13/2 free-ion states as basis, corrected for the effects of intermediate coupling. Selected calculations including the ⁶H_11/2 state make insignificant changes. Average and principal moments do not vary significantly with ρ₆, the sixth-order radial crystal-field integral, unlike g-values. Values for the fourth-order integral ρ₄ and for A₂°〈r²〉, related to the second-order crystal-field potential are estimated as ca. 400 and 160 cm^–1, respectively, and quantitative uncertainties in these values are discussed.