Evidence of field induced slow magnetic relaxation in cis-[Co(hfac)2(H2O)2] exhibiting tri-axial anisotropy with a negative axial component.
- Resource Type
- Article
- Authors
- Korchagin, Denis V.; Palii, Andrew V.; Yureva, Elena A.; Akimov, Alexander V.; Misochko, Eugenii Ya.; Shilov, Gennady V.; Talantsev, Artem D.; Morgunov, Roman B.; Shakin, Alexander A.; Aldoshin, Sergey M.; Tsukerblat, Boris S.
- Source
- Dalton Transactions: An International Journal of Inorganic Chemistry. 6/21/2017, Vol. 46 Issue 23, p7540-7548. 9p.
- Subject
- *MAGNETIC fields
*CRYSTAL field theory
*ELECTRON paramagnetic resonance spectroscopy
*MAGNETIC susceptibility
*MAGNETIC anisotropy
*RAMAN spectroscopy
- Language
- ISSN
- 1477-9226
We report a combined experimental characterization and theoretical modeling of the hexa-coordinated high-spin Co(ii) complex cis-[Co(hfac)2(H2O)2] (I). The magnetic static field (DC) data and EPR spectra (measurements were carried out on the powder samples of diluted samples cis-[Co0.02Zn0.98 (hfac)2(H2O)2]) were analyzed with the aid of the parametric Griffith Hamiltonian for the high-spin Co(ii) supported by the ab initio calculations of the crystal field (CF) parameters, g-factors and superexchange parameters between H-bonded Co(ii) ions in the neighboring molecules in a 1D network. This analysis suggests the presence of the easy axis of magnetic anisotropy and also shows the existence of a significant rhombic component. The detected frequency dependent (AC) susceptibility signal shows that complex I exhibits slow paramagnetic relaxation in the applied DC field belonging thus to the class of non-uniaxial field induced single ion magnets with a negative axial component of anisotropy. It is demonstrated that the main contributions to the relaxation come from the direct one-phonon process dominating at low temperatures, while the contribution of the two-phonon Raman process becomes important with increasing temperature. [ABSTRACT FROM AUTHOR]