Details
| Original language | English |
|---|---|
| Pages (from-to) | 1520-1525 |
| Number of pages | 6 |
| Journal | European Journal of Inorganic Chemistry |
| Volume | 2017 |
| Issue number | 11 |
| Publication status | Published - 17 Mar 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.
Keywords
- Cobalt, Magnetic properties, Single-molecule magnets, Slow magnetic relaxation, Structure elucidation
ASJC Scopus subject areas
- Chemistry(all)
- Inorganic Chemistry
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In: European Journal of Inorganic Chemistry, Vol. 2017, No. 11, 17.03.2017, p. 1520-1525.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
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
UR - http://www.scopus.com/inward/record.url?scp=85016161614&partnerID=8YFLogxK
U2 - 10.1002/ejic.201601335
DO - 10.1002/ejic.201601335
M3 - Article
AN - SCOPUS:85016161614
VL - 2017
SP - 1520
EP - 1525
JO - European Journal of Inorganic Chemistry
JF - European Journal of Inorganic Chemistry
SN - 1434-1948
IS - 11
ER -