Evidence of field induced slow magnetic relaxation in: Cis -[Co(hfac)2(H2O)2] exhibiting tri-axial anisotropy with a negative axial component

Denis V. Korchagin; Andrew V. Palii; Elena A. Yureva; Alexander V. Akimov; Eugenii Ya Misochko; Gennady V. Shilov; Artem D. Talantsev; Roman B. Morgunov; Alexander A. Shakin; Sergey M. Aldoshin; Boris S. Tsukerblat

doi:10.1039/c7dt01236e

Evidence of field induced slow magnetic relaxation in: Cis -[Co(hfac)₂(H₂O)₂] exhibiting tri-axial anisotropy with a negative axial component

Denis V. Korchagin, Andrew V. Palii, Elena A. Yureva, Alexander V. Akimov, Eugenii Ya Misochko, Gennady V. Shilov, Artem D. Talantsev, Roman B. Morgunov, Alexander A. Shakin, Sergey M. Aldoshin, Boris S. Tsukerblat

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

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-[Co_0.02Zn_0.98 (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.

Original language	English
Pages (from-to)	7540-7548
Number of pages	9
Journal	Dalton Transactions
Volume	46
Issue number	23
DOIs	https://doi.org/10.1039/c7dt01236e
State	Published - 1 Jan 2017

ASJC Scopus subject areas

Inorganic Chemistry

Access to Document

10.1039/c7dt01236e

Cite this

Korchagin, D. V., Palii, A. V., Yureva, E. A., Akimov, A. V., Misochko, E. Y., Shilov, G. V., Talantsev, A. D., Morgunov, R. B., Shakin, A. A., Aldoshin, S. M., & Tsukerblat, B. S. (2017). Evidence of field induced slow magnetic relaxation in: Cis -[Co(hfac)₂(H₂O)₂] exhibiting tri-axial anisotropy with a negative axial component. Dalton Transactions, 46(23), 7540-7548. https://doi.org/10.1039/c7dt01236e

@article{c8ce6cf85540480fb0e2d5405a58cdcf,

title = "Evidence of field induced slow magnetic relaxation in: Cis -[Co(hfac)2(H2O)2] exhibiting tri-axial anisotropy with a negative axial component",

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.",

author = "Korchagin, {Denis V.} and Palii, {Andrew V.} and Yureva, {Elena A.} and Akimov, {Alexander V.} and Misochko, {Eugenii Ya} and Shilov, {Gennady V.} and Talantsev, {Artem D.} and Morgunov, {Roman B.} and Shakin, {Alexander A.} and Aldoshin, {Sergey M.} and Tsukerblat, {Boris S.}",

note = "Publisher Copyright: {\textcopyright} 2017 The Royal Society of Chemistry.",

year = "2017",

month = jan,

day = "1",

doi = "10.1039/c7dt01236e",

language = "English",

volume = "46",

pages = "7540--7548",

journal = "Dalton Transactions",

issn = "1477-9226",

publisher = "Royal Society of Chemistry",

number = "23",

}

Korchagin, DV, Palii, AV, Yureva, EA, Akimov, AV, Misochko, EY, Shilov, GV, Talantsev, AD, Morgunov, RB, Shakin, AA, Aldoshin, SM & Tsukerblat, BS 2017, 'Evidence of field induced slow magnetic relaxation in: Cis -[Co(hfac)₂(H₂O)₂] exhibiting tri-axial anisotropy with a negative axial component', Dalton Transactions, vol. 46, no. 23, pp. 7540-7548. https://doi.org/10.1039/c7dt01236e

TY - JOUR

T1 - Evidence of field induced slow magnetic relaxation in

T2 - Cis -[Co(hfac)2(H2O)2] exhibiting tri-axial anisotropy with a negative axial component

AU - Korchagin, Denis V.

AU - Palii, Andrew V.

AU - Yureva, Elena A.

AU - Akimov, Alexander V.

AU - Misochko, Eugenii Ya

AU - Shilov, Gennady V.

AU - Talantsev, Artem D.

AU - Morgunov, Roman B.

AU - Shakin, Alexander A.

AU - Aldoshin, Sergey M.

AU - Tsukerblat, Boris S.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85021752420&partnerID=8YFLogxK

U2 - 10.1039/c7dt01236e

DO - 10.1039/c7dt01236e

M3 - Article

C2 - 28573307

AN - SCOPUS:85021752420

SN - 1477-9226

VL - 46

SP - 7540

EP - 7548

JO - Dalton Transactions

JF - Dalton Transactions

IS - 23

ER -

Evidence of field induced slow magnetic relaxation in: Cis -[Co(hfac)₂(H₂O)₂] exhibiting tri-axial anisotropy with a negative axial component

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this