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Evidence of field induced slow magnetic relaxation in cis-[Co(hfac)2(H2O)2] exhibiting tri-axial anisotropy with a negative axial component
- Source :
- Dalton Transactions. 46:7540-7548
- Publication Year :
- 2017
- Publisher :
- Royal Society of Chemistry (RSC), 2017.
-
Abstract
- 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.
- Subjects :
- Condensed matter physics
010405 organic chemistry
Chemistry
010402 general chemistry
01 natural sciences
Molecular physics
0104 chemical sciences
Ion
law.invention
Inorganic Chemistry
symbols.namesake
Paramagnetism
Magnetic anisotropy
Ab initio quantum chemistry methods
Superexchange
law
symbols
Anisotropy
Raman spectroscopy
Electron paramagnetic resonance
Subjects
Details
- ISSN :
- 14779234 and 14779226
- Volume :
- 46
- Database :
- OpenAIRE
- Journal :
- Dalton Transactions
- Accession number :
- edsair.doi...........a719167e09f9cf8f3290662dba355cdb