Linear trinuclear cobalt(ii) single molecule magnet

2015 ◽  
Vol 44 (6) ◽  
pp. 2865-2870 ◽  
Author(s):  
Yuan-Zhu Zhang ◽  
Andrew J. Brown ◽  
Yin-Shan Meng ◽  
Hao-Ling Sun ◽  
Song Gao
Keyword(s):  
Single Molecule ◽  
Ferromagnetic Coupling ◽  
Coordination Environment ◽  
Single Molecule Magnet ◽  
Drastic Effect

The first linear trinuclear [CoII3] SMM was achieved due to significant intracluster ferromagnetic coupling. This study shows that miniscule changes in the coordination environment of the cobalt centers in this structural archetype can have a drastic effect on the observation of SMM behavior.

A Linear Metal-Metal Bonded Tri-Iron Single-Molecule Magnet

2021 ◽  
Author(s):  
Anandi Srinivasan ◽  
Rebecca A Musgrave ◽  
Mathieu Rouzieres ◽  
Rodolphe Clerac ◽  
John E. McGrady ◽  
...  
Keyword(s):  
Single Molecule ◽  
Complex Cation ◽  
Trinuclear Complex ◽  
Ferromagnetic Coupling ◽  
Single Molecule Magnet ◽  
Metal Metal

The linear trinuclear complex cation [Fe3(DpyF)4]2+ was prepared as [Fe3(DpyF)4](BF4)2·2CH3CN. With large Fe–Fe distances of 2.78 Å, this complex demonstrates intramolecular ferromagnetic coupling between the anisotropic FeII centers (J/kB =...

A series of goblet-like heterometallic pentanuclear [LnIIICuII4] clusters featuring ferromagnetic coupling and single-molecule magnet behavior

2012 ◽  
Vol 48 (87) ◽  
pp. 10736 ◽  
Author(s):  
Qilong Zhu ◽  
Shengchang Xiang ◽  
Tianlu Sheng ◽  
Daqiang Yuan ◽  
Chaojun Shen ◽  
...  
Keyword(s):  
Single Molecule ◽  
Ferromagnetic Coupling ◽  
Single Molecule Magnet

A triangular dysprosium with asymmetric central caps featuring ferromagnetic coupling and single-molecule magnet behaviour

2013 ◽  
Vol 42 (29) ◽  
pp. 10413 ◽  
Author(s):  
Si Shen ◽  
Shufang Xue ◽  
Shuang-Yan Lin ◽  
Lang Zhao ◽  
Jinkui Tang
Keyword(s):  
Single Molecule ◽  
Ferromagnetic Coupling ◽  
Single Molecule Magnet

Ferromagnetic coupling in a chloride-bridged erbium single-molecule magnet

2017 ◽  
Vol 53 (53) ◽  
pp. 7322-7324 ◽  
Author(s):  
J. D. Hilgar ◽  
B. S. Flores ◽  
J. D. Rinehart
Keyword(s):  
Single Molecule ◽  
Ferromagnetic Coupling ◽  
Single Molecule Magnet ◽  
High Anisotropy

We present the first ferromagnetically-coupled Er3+ complex with linked, high-anisotropy Er–COT (COT2− = cyclooctatetraene dianion) subunits.

An unsymmetrical coordination environment leading to two slow relaxation modes in a Dy2 single-molecule magnet

2011 ◽  
Vol 47 (39) ◽  
pp. 10993 ◽  
Author(s):  
Po-Heng Lin ◽  
Wen-Bin Sun ◽  
Mang-Fei Yu ◽  
Guang-Ming Li ◽  
Peng-Fei Yan ◽  
...  
Keyword(s):  
Single Molecule ◽  
Slow Relaxation ◽  
Coordination Environment ◽  
Single Molecule Magnet ◽  
Relaxation Modes

Two azido-bridged [2×2] cobalt(ii) grids featuring single-molecule magnet behaviour

2020 ◽  
Vol 49 (27) ◽  
pp. 9218-9222
Author(s):  
Zhilin Guo ◽  
Yi-Fei Deng ◽  
Yipei Zhang ◽  
Zoe Pikramenou ◽  
Yuan-Zhu Zhang
Keyword(s):  
Single Molecule ◽  
Ferromagnetic Coupling ◽  
Effective Energy ◽  
Energy Barriers ◽  
Single Molecule Magnet

Two Co(ii) [2 × 2] grid-like clusters containing both pyridazine and azido bridges were reported to exhibit overall intramolecular ferromagnetic coupling and field-induced single-molecule magnet behavior with the effective energy barriers up to 56 K.

scholarly journals Counterintuitive Single-Molecule Magnet Behaviour in Two Polymorphs of One-Dimensional Compounds Involving Chiral BINOL-Derived Bisphosphate Ligands

2021 ◽  
Vol 7 (11) ◽  
pp. 150
Author(s):  
Carlo Andrea Mattei ◽  
Bertrand Lefeuvre ◽  
Vincent Dorcet ◽  
Gilles Argouarch ◽  
Olivier Cador ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetic Relaxation ◽  
Magnetic Measurements ◽  
Solvent Mixture ◽  
Zero Field ◽  
Coordination Environment ◽  
Single Molecule Magnet ◽  
One Dimensional ◽  
Slow Magnetic Relaxation ◽  
Coordination Reaction

The coordination reaction of the [Dy(hfac)3(H2O)2] units (hfac− = 1,1,1,5,5,5-hexafluoroacetylacetonate) with the [8′-(Diphenoxylphosphinyl)[1,1′-binaphthalen]-8-yl]diphenoxylphosphine oxide ligand (L) followed by a crystallisation in a 1:3 CH2Cl2:n-hexane solvent mixture led to the isolation of a new polymorph of formula [(Dy(hfac)3((S)-L))3]n (1). The X-ray structure on single crystal of 1 revealed the formation of a mono-dimensional coordination polymer with three crystallographically independent DyIII centres, which crystallised in the polar chiral P21 space group. Ac magnetic measurements highlighted single-molecule magnet behaviour under both zero and 1000 Oe applied magnetic field with magnetic relaxation through quantum tunneling of the magnetisation (QTM, zero field only) and Raman processes. Despite the three crystallographically independent DyIII centres adopting a distorted D4d coordination environment, a single slow magnetic relaxation contribution was observed at a slower rate than its previously studied [(Dy(hfac)3((S)-L))]n (2) polymorph.

Exchange-Biasing in a Dinuclear Dysprosium(III) Single-Molecule Magnet with a Large Energy Barrier for Magnetization Reversal

2019 ◽  
Author(s):  
Tian Han ◽  
Marcus J. Giansiracusa ◽  
Zi-Han Li ◽  
You-Song Ding ◽  
Nicholas F. Chilton ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetization Reversal ◽  
Energy Barrier ◽  
Magnetic Hysteresis ◽  
Large Energy ◽  
Magnetic Studies ◽  
Bridging Ligands ◽  
Single Molecule Magnet ◽  
Exchange Biasing

A dichlorido-bridged dinuclear dysprosium(III) single-molecule magnet [Dy<sub>2</sub>L<sub>2</sub>(<i>µ</i>-Cl)<sub>2</sub>(THF)<sub>2</sub>] has been made using a diamine-bis(phenolate) ligand, H<sub>2</sub>L. Magnetic studies show an energy barrier for magnetization reversal (<i>U</i><sub>eff</sub>) around 1000 K. Exchange-biasing effect is clearly seen in magnetic hysteresis with steps up to 4 K. <i>Ab</i> initio calculations exclude the possibility of pure dipolar origin of this effect leading to the conclusion that super-exchange <i>via</i> the chloride bridging ligands is important.

Correlating Blocking Temperatures in Single Molecule Magnets with Raman Relaxation

2018 ◽  
Author(s):  
Marcus J. Giansiracusa ◽  
Andreas Kostopoulos ◽  
George F. S. Whitehead ◽  
David Collison ◽  
Floriana Tuna ◽  
...  
Keyword(s):  
Relaxation Time ◽  
Single Molecule ◽  
Energy Barrier ◽  
Thermal Relaxation ◽  
Relaxation Mechanism ◽  
Blocking Temperature ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet ◽  
Key Parameter

We report a six coordinate DyIII single-molecule magnet<br>(SMM) with an energy barrier of 1110 K for thermal relaxation of<br>magnetization. The sample shows no retention of magnetization<br>even at 2 K and this led us to find a good correlation between the<br>blocking temperature and the Raman relaxation regime for SMMs.<br>The key parameter is the relaxation time (𝜏<sub>switch</sub>) at the point where<br>the Raman relaxation mechanism becomes more important than<br>Orbach.

The localized electron: magnetic properties

2018 ◽  
Author(s):  
Jean-Pierre Launay ◽  
Michel Verdaguer
Keyword(s):  
Single Molecule ◽  
Model Systems ◽  
Ferromagnetic Coupling ◽  
Single Chain ◽  
Single Molecule Magnets ◽  
Magnetic Systems ◽  
Orbital Interactions ◽  
Prussian Blue Analogues ◽  
Mononuclear Complexes

After preliminaries about electron properties, and definitions in magnetism, one treats the magnetism of mononuclear complexes, in particular spin cross-over, showing the role of cooperativity and the sensitivity to external perturbations. Orbital interactions and exchange interaction are explained in binuclear model systems, using orbital overlap and orthogonality concepts to explain antiferromagnetic or ferromagnetic coupling. The phenomenologically useful Spin Hamiltonian is defined. The concepts are then applied to extended molecular magnetic systems, leading to molecular magnetic materials of various dimensionalities exhibiting bulk ferro- or ferrimagnetism. An illustration is provided by Prussian Blue analogues. Magnetic anisotropy is introduced. It is shown that in some cases, a slow relaxation of magnetization arises and gives rise to appealing single-ion magnets, single-molecule magnets or single-chain magnets, a route to store information at the molecular level.

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