scholarly journals Correlating Axial and Equatorial Ligand Field Effects to the Single-Molecule Magnet Performances of a Family of Dysprosium Bis-Methanediide Complexes

2021 ◽  
Author(s):  
Lewis Thomas-Hargreaves ◽  
Marcus Giansiracusa ◽  
Matthew Gregson ◽  
Emanuele Zanda ◽  
Felix O'Donnell ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Single Molecule ◽  
Ligand Field ◽  
Single Molecule Magnet ◽  
Field Effects ◽  
Equatorial Ligand ◽  
Metal Alkyls

Treatment of the new methanediide-methanide complex [Dy(SCS)(SCSH)(THF)] (1Dy, SCS = {C(PPh2S)2}2-) with alkali metal alkyls and auxillary ethers produces the bis-methanediide complexes [Dy(SCS)2][Dy(SCS)2(K(DME)2)2] (2Dy), [Dy(SCS)2][Na(DME)3] (3Dy) and [Dy(SCS)2][K(2,2,2-cryptand)] (4Dy). For...

Ligand field tuning single-molecule magnet behaviors of two dysprosium dinuclear compounds

Polyhedron ◽  
2017 ◽  
Vol 138 ◽  
pp. 306-311 ◽  
Author(s):  
Yun-Shan Xue ◽  
Jin-Cai Bian ◽  
Meng-Meng Wu ◽  
Pei-Yun Cheng ◽  
Wen-Min Wang ◽  
...  
Keyword(s):  
Single Molecule ◽  
Ligand Field ◽  
Single Molecule Magnet ◽  
Dinuclear Compounds

scholarly journals A Flexible Approach for Engineering Macrocyclic High Performance Pentagonal Bipyramidal Dy(III) Single-Ion Magnets

2020 ◽  
Author(s):  
Angelos Canaj ◽  
Sourav Dey ◽  
Claire Wilson ◽  
Oscar Céspedes ◽  
Rajaraman Gopalan ◽  
...  
Keyword(s):  
Ab Initio ◽  
Single Molecule ◽  
High Performance ◽  
Macrocyclic Ligand ◽  
Hysteresis Loops ◽  
Ligand Field ◽  
Single Molecule Magnet ◽  
Flexible Approach ◽  
High Anisotropy

A strong uniaxial ligand field generated by the Ph3SiO<sup>-</sup> ligand combined with the weak equatorial field of the macrocyclic ligand LN5, generates [DyIII(LN5)(Ph3SiO)2]+, a pentagonal bipyramidal Dy(III) Single-Molecule Magnet with a high anisotropy barrier of 1108 K, and hysteresis loops open up to 14 K. Based on our synthetic blueprint, we use <i>ab initio</i> calculations to predict changes to the macrocycle to increase the barrier to ~ 1800 K.

Ligand field-tuned single-molecule magnet behaviour of 2p–4f complexes

2012 ◽  
Vol 41 (2) ◽  
pp. 505-511 ◽  
Author(s):  
Xue-Lan Mei ◽  
Yue Ma ◽  
Li-Cun Li ◽  
Dai-Zheng Liao
Keyword(s):  
Single Molecule ◽  
Ligand Field ◽  
Single Molecule Magnet

scholarly journals A Flexible Approach for Engineering Macrocyclic High Performance Pentagonal Bipyramidal Dy(III) Single-Ion Magnets

2020 ◽  
Author(s):  
Angelos Canaj ◽  
Sourav Dey ◽  
Claire Wilson ◽  
Oscar Céspedes ◽  
Rajaraman Gopalan ◽  
...  
Keyword(s):  
Ab Initio ◽  
Single Molecule ◽  
High Performance ◽  
Macrocyclic Ligand ◽  
Hysteresis Loops ◽  
Ligand Field ◽  
Single Molecule Magnet ◽  
Flexible Approach ◽  
High Anisotropy

A strong uniaxial ligand field generated by the Ph3SiO<sup>-</sup> ligand combined with the weak equatorial field of the macrocyclic ligand LN5, generates [DyIII(LN5)(Ph3SiO)2]+, a pentagonal bipyramidal Dy(III) Single-Molecule Magnet with a high anisotropy barrier of 1108 K, and hysteresis loops open up to 14 K. Based on our synthetic blueprint, we use <i>ab initio</i> calculations to predict changes to the macrocycle to increase the barrier to ~ 1800 K.

scholarly journals Single-molecule magnet Mn12 on GaAs-supported graphene: Gate field effects from first principles

2022 ◽  
Vol 105 (3) ◽  
Author(s):  
Shuanglong Liu ◽  
Maher Yazback ◽  
James N. Fry ◽  
Xiao-Guang Zhang ◽  
Hai-Ping Cheng
Keyword(s):  
Single Molecule ◽  
First Principles ◽  
Single Molecule Magnet ◽  
Field Effects

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.

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