Single-crystal magnetic studies of tris(ethylenediamine)nickel(II) nitrate

Abstract

The magnetic anisotropy of [Ni(en)₃][NO₃]₂(en = ethylenediamine) has been determined from 4.58 to 300 K and the average susceptibility has been measured down to 2.01 K at field strengths ranging from 10 to 50 KG. The results are interpreted on a point-charge model for D₃ symmetry using the parameters A₂⁰<r²> =–630 cm^–1, ρ₄= 7 000 cm^–1, α= 25°, F₂= 1 350 cm^–1, F₄= 70 cm^–1, ζ= 400 cm^–1, and k= 1.0. The calculations show that a twist from octahedral toward trigonal-prismatic co-ordination has little effect on the magnetism. The magnetization and low-temperature anisotropy are consistent with the compound being weakly antiferromagnetic.