Two C2v symmetry dysprosium(iii) single-molecule magnets with effective energy barriers over 600 K

2021 ◽  
Author(s):  
Xixi Meng ◽  
Mengmeng Wang ◽  
Xiaoshuang Gou ◽  
Wenlong Lan ◽  
Kexin Jia ◽  
...  
Keyword(s):  
Single Molecule ◽  
High Performance ◽  
Effective Energy ◽  
Magnetization Dynamics ◽  
Energy Barriers ◽  
Single Molecule Magnets

Two high-performance C2v symmetry dysprosium(iii) single-molecule magnets were synthesized. The mechanism of magnetization dynamics was studied in detail.

scholarly journals Dysprosiacarboranes: A New Type of Organometallic Single-Molecule Magnets

2019 ◽  
Author(s):  
Peng-Bo Jin ◽  
Yuan-Qi Zhai ◽  
Ke-Xin Yu ◽  
Richard E. P. Winpenny ◽  
Yan-Zhen Zheng
Keyword(s):  
Single Molecule ◽  
Energy Barrier ◽  
High Performance ◽  
Blocking Temperature ◽  
Effective Energy ◽  
Single Molecule Magnets ◽  
Linear Complex ◽  
Substitution Pattern ◽  
New Type

Dicarbollide ion, nido-C<sub>2</sub>B<sub>9</sub>H<sub>11</sub><sup>2-</sup> is isoelectronic with cyclopentadienyl. Here we make dysprosiacarboranes, namely [(C<sub>2</sub>B<sub>9</sub>H<sub>11</sub>)<sub>2</sub>Ln(THF)<sub>2</sub>][Na(THF)<sub>5</sub>] (Ln = Dy, <b>1Dy</b>) and [(THF)<sub>3</sub>(μ-H)<sub>3</sub>Li]<sub>2</sub>[{η<sup>5</sup>-C<sub>6</sub>H<sub>4</sub>(CH<sub>2</sub>)<sub>2</sub>C<sub>2</sub>B<sub>9</sub>H<sub>9</sub>}Dy{η<sup>2</sup>:η<sup>5</sup>-C<sub>6</sub>H<sub>4</sub>(CH<sub>2</sub>)<sub>2</sub>C<sub>2</sub>B<sub>9</sub>H<sub>9</sub>}<sub>2</sub>Li] <b>3</b> and show that dicarbollide ligands impose strong magnetic axiality on the central Dy(III) ion. The effective energy barrier (Ueff) for loss of magnetisation can be varied by the substitution pattern on the dicarbollide. This is demonstrated by comparing complexes of nido-C<sub>2</sub>B<sub>9</sub>H<sub>11</sub><sup>2-</sup> and nido-[o-xylylene-C<sub>2</sub>B<sub>9</sub>H<sub>9</sub>]<sup>2-</sup> which show Ueff of 430(5) K and 804(7) K, respectively. The blocking temperature defined by the open hysteresis temperature of 3 reaches 6.8 K. Moreover, the linear complex [Dy(C<sub>2</sub>B<sub>9</sub>H<sub>11</sub>)<sub>2</sub>]<sup>-</sup> is predicted to have comparable SMM properties with linear [Dy(CpMe<sub>3</sub>)<sub>2</sub>]<sup>+</sup> complex. As such, carboranyl ligands and its derivatives may open a new type of organometallic ligands for high-performance SMM design. <br>

Relaxation dynamics in see-saw shaped Dy(iii) single-molecule magnets

2020 ◽  
Vol 7 (24) ◽  
pp. 4805-4812 ◽  
Author(s):  
Katie L. M. Harriman ◽  
Jesse Murillo ◽  
Elizaveta A. Suturina ◽  
Skye Fortier ◽  
Muralee Murugesu
Keyword(s):  
Single Molecule ◽  
Zero Field ◽  
Effective Energy ◽  
Relaxation Dynamics ◽  
Energy Barriers ◽  
Single Molecule Magnets

Unusual see-saw shaped Dy(iii) single-molecule magnets, [K(DME)n][LArDy(X)2] (LAr = {C6H4[(2,6-iPrC6H3)NC6H4]2}2−), X = Cl (1) and X = I (2) were synthesized and display high effective energy barriers (Ueff = 1278–1334 K) in zero field.

scholarly journals Dysprosiacarboranes: A New Type of Organometallic Single-Molecule Magnets

2019 ◽  
Author(s):  
Peng-Bo Jin ◽  
Yuan-Qi Zhai ◽  
Ke-Xin Yu ◽  
Richard E. P. Winpenny ◽  
Yan-Zhen Zheng
Keyword(s):  
Single Molecule ◽  
Energy Barrier ◽  
High Performance ◽  
Blocking Temperature ◽  
Effective Energy ◽  
Single Molecule Magnets ◽  
Linear Complex ◽  
Substitution Pattern ◽  
New Type

Dicarbollide ion, nido-C<sub>2</sub>B<sub>9</sub>H<sub>11</sub><sup>2-</sup> is isoelectronic with cyclopentadienyl. Here we make dysprosiacarboranes, namely [(C<sub>2</sub>B<sub>9</sub>H<sub>11</sub>)<sub>2</sub>Ln(THF)<sub>2</sub>][Na(THF)<sub>5</sub>] (Ln = Dy, <b>1Dy</b>) and [(THF)<sub>3</sub>(μ-H)<sub>3</sub>Li]<sub>2</sub>[{η<sup>5</sup>-C<sub>6</sub>H<sub>4</sub>(CH<sub>2</sub>)<sub>2</sub>C<sub>2</sub>B<sub>9</sub>H<sub>9</sub>}Dy{η<sup>2</sup>:η<sup>5</sup>-C<sub>6</sub>H<sub>4</sub>(CH<sub>2</sub>)<sub>2</sub>C<sub>2</sub>B<sub>9</sub>H<sub>9</sub>}<sub>2</sub>Li] <b>3</b> and show that dicarbollide ligands impose strong magnetic axiality on the central Dy(III) ion. The effective energy barrier (Ueff) for loss of magnetisation can be varied by the substitution pattern on the dicarbollide. This is demonstrated by comparing complexes of nido-C<sub>2</sub>B<sub>9</sub>H<sub>11</sub><sup>2-</sup> and nido-[o-xylylene-C<sub>2</sub>B<sub>9</sub>H<sub>9</sub>]<sup>2-</sup> which show Ueff of 430(5) K and 804(7) K, respectively. The blocking temperature defined by the open hysteresis temperature of 3 reaches 6.8 K. Moreover, the linear complex [Dy(C<sub>2</sub>B<sub>9</sub>H<sub>11</sub>)<sub>2</sub>]<sup>-</sup> is predicted to have comparable SMM properties with linear [Dy(CpMe<sub>3</sub>)<sub>2</sub>]<sup>+</sup> complex. As such, carboranyl ligands and its derivatives may open a new type of organometallic ligands for high-performance SMM design. <br>

Rare CH3O−/CH3CH2O−-bridged nine-coordinated binuclear DyIII single-molecule magnets (SMMs) significantly regulate and enhance the effective energy barriers

CrystEngComm ◽  
2020 ◽  
Vol 22 (10) ◽  
pp. 1712-1724 ◽  
Author(s):  
Sheng Zhang ◽  
Nan Shen ◽  
Sha Liu ◽  
Rong Ma ◽  
Yi-Quan Zhang ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Single Molecule ◽  
Effective Energy ◽  
Energy Barriers ◽  
Single Molecule Magnets ◽  
Efficient Approach

This work presents an efficient approach to regulating and enhancing the magnetic anisotropy barriers through using bridged CH3O− anion or CH3CH2O− anion and constructing triple bridges.

Enhanced energy barriers triggered by magnetic anisotropy modulation via tuning the functional groups on the bridging ligands in Dy2 single-molecule magnets

2018 ◽  
Vol 47 (42) ◽  
pp. 15197-15205 ◽  
Author(s):  
Yaru Qin ◽  
Yu Jing ◽  
Yu Ge ◽  
Wei Liu ◽  
Yahong Li ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Functional Groups ◽  
Single Molecule ◽  
Energy Barrier ◽  
Energy Barriers ◽  
Single Molecule Magnets ◽  
Bridging Ligands

Two dinuclear dysprosium complexes of 1 and 2 have been synthesized and both of them exhibit SMM behavior. The energy barrier is enhanced ca. 35 K by elaborately tuning the backbones of the ligands.

scholarly journals Single-molecule magnet properties of a monometallic dysprosium pentalene complex

2018 ◽  
Vol 54 (51) ◽  
pp. 7085-7088 ◽  
Author(s):  
Alexander F. R. Kilpatrick ◽  
Fu-Sheng Guo ◽  
Benjamin M. Day ◽  
Akseli Mansikkamäki ◽  
Richard A. Layfield ◽  
...  
Keyword(s):  
Single Molecule ◽  
Energy Barriers ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet ◽  
Dysprosium Complex

The pentalene-ligated dysprosium complex [(η8-Pn†)Dy(Cp*)] (1Dy) (Pn† = [1,4-(iPr3Si)2C8H4]2−) and its magnetically dilute analogue are single-molecule magnets, with energy barriers of 245 cm−1.

Emerging Trends on Designing High-Performance Dysprosium(III) Single-Molecule Magnets

2022 ◽  
pp. 307-319
Author(s):  
Tesfay G. Ashebr ◽  
Hui Li ◽  
Xu Ying ◽  
Xiao-Lei Li ◽  
Chen Zhao ◽  
...  
Keyword(s):  
Single Molecule ◽  
High Performance ◽  
Single Molecule Magnets ◽  
Emerging Trends

High performance single-molecule magnets, Orbach or Raman relaxation suppression?

2020 ◽  
Vol 7 (13) ◽  
pp. 2478-2486 ◽  
Author(s):  
Alejandro Castro-Alvarez ◽  
Yolimar Gil ◽  
Leonel Llanos ◽  
Daniel Aravena
Keyword(s):  
Ab Initio ◽  
Single Molecule ◽  
High Performance ◽  
Blocking Temperature ◽  
Single Molecule Magnets

Relaxation mechanisms limiting the blocking temperature for high-performance single molecule magnets (SMMs) are investigated. Best SMMs are limited by the exponential regime. Current ab initio methods can yield accurate estimations for this limit.

scholarly journals Correlating blocking temperatures with relaxation mechanisms in monometallic single-molecule magnets with high energy barriers (Ueff > 600 K)

2019 ◽  
Vol 55 (49) ◽  
pp. 7025-7028 ◽  
Author(s):  
Marcus J. Giansiracusa ◽  
Andreas K. Kostopoulos ◽  
David Collison ◽  
Richard E. P. Winpenny ◽  
Nicholas F. Chilton
Keyword(s):  
Single Molecule ◽  
High Energy ◽  
Energy Barriers ◽  
Single Molecule Magnets

Correlating blocking temperatures with relaxation mechanisms in single-molecule magnets.

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