Field-Supported Slow Magnetic Relaxation in Hexacoordinate CoII Complexes with Easy Plane Anisotropy

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Autoren

  • Cyril Rajnák
  • Ján Titiš
  • Ján Moncoľ
  • Franz Renz
  • Roman Boča

Organisationseinheiten

Externe Organisationen

  • Slowakische Technische Universität Bratislava (STU)
  • Ss. Cyril and Methodius University
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Details

OriginalspracheEnglisch
Seiten (von - bis)1520-1525
Seitenumfang6
FachzeitschriftEuropean Journal of Inorganic Chemistry
Jahrgang2017
Ausgabenummer11
PublikationsstatusVeröffentlicht - 17 März 2017

Abstract

Two mononuclear cobalt(II) complexes containing four equatorial 4-benzylpyridine and two axial chlorido and/or thiocyanato ligands {[Co[L]4X2]; X = Cl or NCS} possess easy plane magnetic anisotropy, as determined by magnetic susceptibility and magnetization analyses, and confirmed by ab initio calculations (D = +106 and +95 cm–1). AC susceptibility measurements show a slow magnetic relaxation with two or three relaxation branches. The low-frequency pathway occurs at about 1–10 Hz, and it disappears progressively upon heating. The high-frequency mode exists at frequency ranges above 500 Hz. The characteristics of these field-induced single-molecule magnets strongly depend upon the applied magnetic field, which causes a prolongation of the low-frequency relaxation time and a shortening of the high-frequency one. At 1.0 T and 1.9 K the relaxation time for the low-frequency pathway is as slow as 756 or 164 ms for X = Cl or X = NCS, respectively.

ASJC Scopus Sachgebiete

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Field-Supported Slow Magnetic Relaxation in Hexacoordinate CoII Complexes with Easy Plane Anisotropy. / Rajnák, Cyril; Titiš, Ján; Moncoľ, Ján et al.
in: European Journal of Inorganic Chemistry, Jahrgang 2017, Nr. 11, 17.03.2017, S. 1520-1525.

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Rajnák C, Titiš J, Moncoľ J, Renz F, Boča R. Field-Supported Slow Magnetic Relaxation in Hexacoordinate CoII Complexes with Easy Plane Anisotropy. European Journal of Inorganic Chemistry. 2017 Mär 17;2017(11):1520-1525. doi: 10.1002/ejic.201601335
Rajnák, Cyril ; Titiš, Ján ; Moncoľ, Ján et al. / Field-Supported Slow Magnetic Relaxation in Hexacoordinate CoII Complexes with Easy Plane Anisotropy. in: European Journal of Inorganic Chemistry. 2017 ; Jahrgang 2017, Nr. 11. S. 1520-1525.
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title = "Field-Supported Slow Magnetic Relaxation in Hexacoordinate CoII Complexes with Easy Plane Anisotropy",
abstract = "Two mononuclear cobalt(II) complexes containing four equatorial 4-benzylpyridine and two axial chlorido and/or thiocyanato ligands {[Co[L]4X2]; X = Cl or NCS} possess easy plane magnetic anisotropy, as determined by magnetic susceptibility and magnetization analyses, and confirmed by ab initio calculations (D = +106 and +95 cm–1). AC susceptibility measurements show a slow magnetic relaxation with two or three relaxation branches. The low-frequency pathway occurs at about 1–10 Hz, and it disappears progressively upon heating. The high-frequency mode exists at frequency ranges above 500 Hz. The characteristics of these field-induced single-molecule magnets strongly depend upon the applied magnetic field, which causes a prolongation of the low-frequency relaxation time and a shortening of the high-frequency one. At 1.0 T and 1.9 K the relaxation time for the low-frequency pathway is as slow as 756 or 164 ms for X = Cl or X = NCS, respectively.",
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Download

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T1 - Field-Supported Slow Magnetic Relaxation in Hexacoordinate CoII Complexes with Easy Plane Anisotropy

AU - Rajnák, Cyril

AU - Titiš, Ján

AU - Moncoľ, Ján

AU - Renz, Franz

AU - Boča, Roman

N1 - Funding information: The Slovak Grant Agency VEGA (VEGA 1/0522/14, VEGA 1/0534/16), The Slovak Research and Development Agency APVV (APVV-14-0078), and the Deutscher Akademischer Austausch Dienst (DAAD) program Germany/Slovakia are acknowledged for financial support. Dr. J. Kožíšek (Slovak University of Technology, Bratislava) and Prof. J. Marek (Brno) are acknowledged for the single-crystal X-ray experiments.

PY - 2017/3/17

Y1 - 2017/3/17

N2 - Two mononuclear cobalt(II) complexes containing four equatorial 4-benzylpyridine and two axial chlorido and/or thiocyanato ligands {[Co[L]4X2]; X = Cl or NCS} possess easy plane magnetic anisotropy, as determined by magnetic susceptibility and magnetization analyses, and confirmed by ab initio calculations (D = +106 and +95 cm–1). AC susceptibility measurements show a slow magnetic relaxation with two or three relaxation branches. The low-frequency pathway occurs at about 1–10 Hz, and it disappears progressively upon heating. The high-frequency mode exists at frequency ranges above 500 Hz. The characteristics of these field-induced single-molecule magnets strongly depend upon the applied magnetic field, which causes a prolongation of the low-frequency relaxation time and a shortening of the high-frequency one. At 1.0 T and 1.9 K the relaxation time for the low-frequency pathway is as slow as 756 or 164 ms for X = Cl or X = NCS, respectively.

AB - Two mononuclear cobalt(II) complexes containing four equatorial 4-benzylpyridine and two axial chlorido and/or thiocyanato ligands {[Co[L]4X2]; X = Cl or NCS} possess easy plane magnetic anisotropy, as determined by magnetic susceptibility and magnetization analyses, and confirmed by ab initio calculations (D = +106 and +95 cm–1). AC susceptibility measurements show a slow magnetic relaxation with two or three relaxation branches. The low-frequency pathway occurs at about 1–10 Hz, and it disappears progressively upon heating. The high-frequency mode exists at frequency ranges above 500 Hz. The characteristics of these field-induced single-molecule magnets strongly depend upon the applied magnetic field, which causes a prolongation of the low-frequency relaxation time and a shortening of the high-frequency one. At 1.0 T and 1.9 K the relaxation time for the low-frequency pathway is as slow as 756 or 164 ms for X = Cl or X = NCS, respectively.

KW - Cobalt

KW - Magnetic properties

KW - Single-molecule magnets

KW - Slow magnetic relaxation

KW - Structure elucidation

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