Ligands effects on the magnetic anisotropy of tetrahedral cobalt complexes

2014 ◽  
Vol 50 (82) ◽  
pp. 12266-12269 ◽  
Author(s):  
Mohamed R. Saber ◽  
Kim R. Dunbar
Keyword(s):  
Magnetic Anisotropy ◽  
Cobalt Complexes ◽  
Slow Relaxation ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Mononuclear Cobalt

A trend of increasingly more negative zero-field splitting parameters D was observed for a series of pseudo-tetrahedral mononuclear cobalt complexes, Co(L)2I2 (1–3) (L = quinolone, PPh3 or AsPh3) in going down the group from N to P and As (1 = +9.2 cm−1, 2 = −36.9 cm−1 and 3 = −74.7 cm−1) with 2 and 3 exhibiting slow relaxation of the magnetization under an applied DC field.

Modulation of the coordination environment: a convenient approach to tailor magnetic anisotropy in seven coordinate Co(ii) complexes

2016 ◽  
Vol 52 (4) ◽  
pp. 753-756 ◽  
Author(s):  
Mamon Dey ◽  
Snigdha Dutta ◽  
Bipul Sarma ◽  
Ramesh Ch. Deka ◽  
Nayanmoni Gogoi
Keyword(s):  
Magnetic Anisotropy ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Coordination Environment ◽  
Zero Field Splitting Parameter ◽  
Convenient Approach ◽  
Splitting Parameter ◽  
Remarkable Deviation

Subtle modulation of the coordination environment in seven coordinate Co(ii) complexes leads to a remarkable deviation in the axial zero field splitting parameter (D) in a predictable fashion.

Enhancement of magnetic anisotropy in a Mn–Bi heterobimetallic complex

2016 ◽  
Vol 52 (76) ◽  
pp. 11394-11397 ◽  
Author(s):  
Tyler J. Pearson ◽  
Majed S. Fataftah ◽  
Danna E. Freedman
Keyword(s):  
Magnetic Anisotropy ◽  
Molecular Species ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Heterobimetallic Complex

A novel Mn2+⋯Bi3+ heterobimetallic complex, featuring the closest Mn⋯Bi interaction for a paramagnetic molecular species, exhibits unusually large axial zero-field splitting.

scholarly journals EMR-related problems at the interface between the crystal field Hamiltonians and the zero-field splitting Hamiltonians

Nukleonika ◽  
2015 ◽  
Vol 60 (3) ◽  
pp. 377-383
Author(s):  
Czesław Rudowicz ◽  
Mirosław Karbowiak
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Anisotropy ◽  
Crystal Field ◽  
Recent Literature ◽  
Ligand Field ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Effective Spin ◽  
Spin Hamiltonians

Abstract The interface between optical spectroscopy, electron magnetic resonance (EMR), and magnetism of transition ions forms the intricate web of interrelated notions. Major notions are the physical Hamiltonians, which include the crystal field (CF) (or equivalently ligand field (LF)) Hamiltonians, and the effective spin Hamiltonians (SH), which include the zero-field splitting (ZFS) Hamiltonians as well as to a certain extent also the notion of magnetic anisotropy (MA). Survey of recent literature has revealed that this interface, denoted CF (LF) ↔ SH (ZFS), has become dangerously entangled over the years. The same notion is referred to by three names that are not synonymous: CF (LF), SH (ZFS), and MA. In view of the strong need for systematization of nomenclature aimed at bringing order to the multitude of different Hamiltonians and the associated quantities, we have embarked on this systematization. In this article, we do an overview of our efforts aimed at providing a deeper understanding of the major intricacies occurring at the CF (LF) ↔ SH (ZFS) interface with the focus on the EMR-related problems for transition ions.

Correlating magnetic anisotropy with the subtle coordination geometry variation of a series of cobalt(ii)-sulfonamide complexes

2019 ◽  
Vol 48 (41) ◽  
pp. 15419-15426 ◽  
Author(s):  
Tao Wu ◽  
Yuan-Qi Zhai ◽  
Yi-Fei Deng ◽  
Wei-Peng Chen ◽  
Tao Zhang ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Zero Field ◽  
Coordination Geometry ◽  
Zero Field Splitting ◽  
Tetrahedral Geometry ◽  
Coordination Environment ◽  
Zero Field Splitting Parameter ◽  
Mononuclear Cobalt ◽  
Splitting Parameter ◽  
The Ideal

The distortion degree from the ideal tetrahedral geometry has been correlated with the zero-field splitting parameter in a series of mononuclear cobalt(ii)-sulfonamide complexes with a CoN4 coordination environment.

Slow magnetic relaxation in mononuclear seven-coordinate cobalt(ii) complexes with easy plane anisotropy

2015 ◽  
Vol 44 (25) ◽  
pp. 11482-11490 ◽  
Author(s):  
Lei Chen ◽  
Shu-Yang Chen ◽  
Yi-Chen Sun ◽  
Yu-Mei Guo ◽  
Lu Yu ◽  
...  
Keyword(s):  
Magnetic Relaxation ◽  
Slow Relaxation ◽  
Positive Zero ◽  
Pentagonal Bipyramid ◽  
Zero Field ◽  
Relaxation Behaviour ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Plane Anisotropy ◽  
Slow Magnetic Relaxation

Two mononuclear pentagonal bipyramid cobalt(ii) complexes with positive zero-field splitting D values were demonstrated to exhibit field-induced slow relaxation behaviour.

scholarly journals Redetermination of Zero-Field Splitting in [Co(qu)2Br2] and [Ni(PPh3)2Cl2] Complexes

2016 ◽  
Vol 15 (2) ◽  
pp. 200-211 ◽  
Author(s):  
Dominik Lomjanský ◽  
Filip Varga ◽  
Cyril Rajnák ◽  
Ján Moncoľ ◽  
Roman Boča ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Ab Initio ◽  
Molecular Structures ◽  
Zero Field ◽  
Squid Magnetometry ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Crystal And Molecular Structures ◽  
Zero Field Splitting Parameter ◽  
Splitting Parameter

AbstractA mononuclear CoII complex, [Co(qu)2Br2], and NiII complex, [Ni(PPh3)2Cl2], (qu = quinoline, PPh3 = triphenylphosphine) have been reinvestigated. Their crystal and molecular structures are reported along with IR and UV-Vis spectra. Magnetism of both complexes has been studied by using the DC SQUID magnetometry. These complexes exhibit a moderate magnetic anisotropy expressed by zero-field splitting parameter D. The D-value is positive for both complexes with D/hc = +5.94 cm−1 and D/hc = +12.76 cm−1, that is also confirmed by ab initio calculations.

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