Slow magnetic relaxation in a Co(ii) octahedral–tetrahedral system formed of a [CoL3]2+ core with L = bis(diphenylphosphanoxido) methane and tetrahedral [CoBr4]2− counter anions

2017 ◽  
Vol 46 (13) ◽  
pp. 4148-4151 ◽  
Author(s):  
F. Varga ◽  
C. Rajnák ◽  
J. Titiš ◽  
J. Moncoľ ◽  
R. Boča
Keyword(s):  
Relaxation Time ◽  
Magnetic Anisotropy ◽  
Magnetic Relaxation ◽  
Slow Magnetic Relaxation ◽  
Tetrahedral System

A bimetallic Co(ii) compound [Co(dppmO,O)3][CoBr4] consisting of cationic octahedral and anionic tetrahedral units shows a sizable magnetic anisotropy and field-supported slow magnetic relaxation with the relaxation time τ = 0.1–0.3 s at T = 1.9 K.

scholarly journals Slow Magnetic Relaxation in a One-Dimensional Coordination Polymer Constructed from Hepta-Coordinate Cobalt(II) Nodes

2020 ◽  
Vol 6 (4) ◽  
pp. 45
Author(s):  
Amit Kumar Mondal ◽  
Arpan Mondal ◽  
Sanjit Konar
Keyword(s):  
Magnetic Susceptibility ◽  
Coordination Polymer ◽  
Magnetic Anisotropy ◽  
Ab Initio Calculations ◽  
Direct Current ◽  
Magnetic Relaxation ◽  
Relaxation Processes ◽  
Ac Magnetic Susceptibility ◽  
One Dimensional ◽  
Slow Magnetic Relaxation

A one-dimensional coordination polymer was synthesized employing hepta-coordinate CoII as nodes and dicyanamide as linkers. Detailed direct current (DC) and alternating current (AC) magnetic susceptibility measurements reveal the presence of field-induced slow magnetic relaxation behavior of the magnetically isolated seven-coordinate CoII center with an easy-plane magnetic anisotropy. Detailed ab initio calculations were performed to understand the magnetic relaxation processes. To our knowledge, the reported complex represents the first example of slow magnetic relaxation in a one-dimensional coordination polymer constructed from hepta-coordinate CoII nodes and dicyanamide linkers.

scholarly journals Slow magnetic relaxation in a {CoIICoIII2} complex containing a high magnetic anisotropy trigonal bipyramidal CoII centre

2018 ◽  
Vol 47 (28) ◽  
pp. 9237-9240 ◽  
Author(s):  
Alexandra Collet ◽  
Gavin A. Craig ◽  
María José Heras Ojea ◽  
Lakshmi Bhaskaran ◽  
Claire Wilson ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Relaxation ◽  
Easy Plane ◽  
Trigonal Bipyramidal ◽  
Slow Magnetic Relaxation

Incorporation of a trigonal bipyramidal CoII centre in {CoIICoIII2} leads to a large, easy-plane magnetic anisotropy and slow magnetic relaxation.

Slow magnetic relaxation in a μ1,1′-azido cobalt(ii) methylquinoline chain complex

2018 ◽  
Vol 47 (44) ◽  
pp. 15745-15750 ◽  
Author(s):  
Cyril Rajnák ◽  
Ľubor Dlháň ◽  
Ján Moncol ◽  
Ján Titiš ◽  
Roman Boča
Keyword(s):  
Relaxation Time ◽  
External Field ◽  
Magnetic Relaxation ◽  
Low Frequency ◽  
Chain Complex ◽  
Frequency Mode ◽  
Chain Architecture ◽  
1D Chain ◽  
Slow Magnetic Relaxation ◽  
Low Frequency Mode

A [Co(N3)2(mqu)] complex with a 1D chain architecture (mqu – 4-methylquinoline) shows slow magnetic relaxation with three distinct modes. The relaxation time strongly depends upon the applied external field. The low-frequency mode exhibits a relaxation time longer than one second: τLF = 1.6(2) s at BDC = 0.8 T and T = 1.9 K.

Coligand Effects on the Field-Induced Double Slow Magnetic Relaxation in Six-Coordinate Cobalt(II) Single-Ion Magnets (SIMs) with Positive Magnetic Anisotropy

2019 ◽  
Vol 58 (23) ◽  
pp. 15726-15740 ◽  
Author(s):  
Julia Vallejo ◽  
Marta Viciano-Chumillas ◽  
Francisco Lloret ◽  
Miguel Julve ◽  
Isabel Castro ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Relaxation ◽  
Slow Magnetic Relaxation

scholarly journals Slow Magnetic Relaxation in Distorted Tetrahedral Dy(III) Aryloxide Complexes

2021 ◽  
Author(s):  
Vijay Parmar ◽  
Gemma Kate Gransbury ◽  
George F. S. Whitehead ◽  
David P Mills ◽  
Richard E. P. Winpenny
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Relaxation ◽  
Easy Axis ◽  
Slow Magnetic Relaxation

Three distorted tetrahedral Dy(III) aryloxide complexes, [Na(THF)6][Dy(OArAd2tBu)2Cl2] (1) (OArAd2tBu = OC6H2Adamantyl2-2,6-tBu-4) and [Na(THF)6][Dy(OMes*)3X] (X = Cl, 2; BH4, 3), (OMes* = OC6H2tBu3-2,4,6) exhibit easy axis magnetic anisotropy and slow magnetic...

Hybrid organic–inorganic connectivity of NdIII(pyrazine-N,N′-dioxide)[CoIII(CN)6]3− coordination chains for creating near-infrared emissive Nd(iii) showing field-induced slow magnetic relaxation

2018 ◽  
Vol 47 (24) ◽  
pp. 7870-7874 ◽  
Author(s):  
Szymon Chorazy ◽  
Tomasz Charytanowicz ◽  
Junhao Wang ◽  
Shin-ichi Ohkoshi ◽  
Barbara Sieklucka
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Relaxation ◽  
Near Infrared ◽  
Nir Fluorescence ◽  
Slow Magnetic Relaxation

Organic pzdo and inorganic hexacyanidocobaltate(iii) support the formation of Nd(iii) complexes showing NIR fluorescence and magnetic anisotropy.

Slow magnetic relaxation in high-coordinate Co(ii) and Fe(ii) compounds bearing neutral tetradentate ligands

2021 ◽  
Author(s):  
Min Peng ◽  
Xiao-Fan Wu ◽  
Li-Xin Wang ◽  
Si-Huai Chen ◽  
Jing Xiang ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Relaxation ◽  
Effective Spin ◽  
Uniaxial Magnetic Anisotropy ◽  
Tetradentate Ligands ◽  
Spin Reversal ◽  
Slow Magnetic Relaxation ◽  
D Value

7-coordinate Co(ii) compound has a very large positive D value (56.2 cm−1) with an effective spin-reversal barrier of Ueff = 100 K (71.4 cm−1). In contrast, the 8-coordinate Fe(ii) compound exhibits uniaxial magnetic anisotropy.

Octahedral Yb(iii) complexes embedded in [CoIII(CN)6]-bridged coordination chains: combining sensitized near-infrared fluorescence with slow magnetic relaxation

2017 ◽  
Vol 46 (40) ◽  
pp. 13668-13672 ◽  
Author(s):  
Szymon Chorazy ◽  
Michał Rams ◽  
Junhao Wang ◽  
Barbara Sieklucka ◽  
Shin-ichi Ohkoshi
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Relaxation ◽  
Near Infrared ◽  
Infrared Range ◽  
Near Infrared Fluorescence ◽  
Slow Magnetic Relaxation ◽  
Near Infrared Range

The rare octahedral YbIII complexes formed in the bimetallic Yb–Co chains reveal significant magnetic anisotropy and photoluminescence activity in the near-infrared range.

Magnetic anisotropy and slow magnetic relaxation processes of cobalt(ii)-pseudohalide complexes

2019 ◽  
Vol 48 (28) ◽  
pp. 10743-10752 ◽  
Author(s):  
Hui-Hui Cui ◽  
Yi-Quan Zhang ◽  
Xue-Tai Chen ◽  
Zhenxing Wang ◽  
Zi-Ling Xue
Keyword(s):  
Magnetic Anisotropy ◽  
Ab Initio ◽  
Magnetic Relaxation ◽  
Magnetic Measurements ◽  
Relaxation Processes ◽  
Slow Magnetic Relaxation

Magnetic measurements, HFEPR and ab initio calculations were used to study the magnetic anisotropies and magnetic relaxation of four cobalt(ii)-pseudohalide complexes.

scholarly journals A large axial magnetic anisotropy in trigonal bipyramidal Fe(ii)

2020 ◽  
Vol 56 (50) ◽  
pp. 6826-6829
Author(s):  
Moya A. Hay ◽  
Arup Sarkar ◽  
Gavin A. Craig ◽  
Katie E. R. Marriott ◽  
Claire Wilson ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Coordination Sphere ◽  
Magnetic Relaxation ◽  
Geometric Distortion ◽  
Trigonal Bipyramidal ◽  
Slow Magnetic Relaxation

Minimising geometric distortion in the first coordination sphere generates a large axial magnetic anisotropy in trigonal bipyramidal Fe(ii) and rare slow magnetic relaxation.

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