EPR and magnetization studies on single crystals of a heterometallic (Cu^{II}} and Cr^{III}) complex: zero-field splitting determination

Nikolina Novosel; Dijana Žilić; Damir Pajić; Marijana Jurić; Berislav Perić; Krešo Zadro; Boris Rakvin; Pavica Planinić

doi:10.1016/j.solidstatesciences.2008.01.021

paper

EPR and magnetization studies on single crystals of a heterometallic (Cu^{II}} and Cr^{III}) complex: zero-field splitting determination

arXiv:0801.3763 · doi:10.1016/j.solidstatesciences.2008.01.021

Abstract

Magnetic properties of single crystals of the heterometallic complex [Cu(bpy) $_{3}$ ] $_{2}$ [Cr(C $_{2}$ O $_{4}$ ) $_{3}$ ]NO $_{3} \cdot$ 9H $_{2}$ O (bpy = 2,2'-bipyridine) have been investigated. From the recorded EPR spectra, the spin-Hamiltonian parameters have been determined. The magnetization measurements have shown magnetic anisotropy at low temperatures, which has been analysed as a result of the zero-field splitting of the Cr $^{III}$ ion. By fitting the exactly derived magnetization expression to the measured magnetization data, the axial zero-field splitting parameter, D, has been calculated. Comparing to the EPR measurements, it has been confirmed that $D$ can be determined from the measurements of the macroscopic magnetization on the single crystals.