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

Abstract

The principal magnetic moments of crystals of hexakis(antipyrine)thulium(III) tri-iodide (antipyrine is 2,3-dimethyl-1-phenyl-Δ³-pyrazolin-5-one), have been measured in the temperature range 300–80 K. They are interpreted within a free-ion f¹², ³H₆+³H₄, basis perturbed by a crystal field of D_3d symmetry. The effects of intermediate coupling on the basis eigenvectors has been included into the crystal-field calculations. Values related to the coefficient of the second-order potential and for the fourth-order radial parameter [A₂⁰〈r²〉 and ρ₄, respectively] have been determined. Magnetic moments are not affected by changes in the sixth-order radial integral ρ₆ significantly.