New members of the polynuclear manganese family: MnII2MnIII2 single-molecule magnets and MnII3MnIII8 antiferromagnetic complexes. Synthesis and magnetostructural correlations

2020 ◽  
Vol 49 (40) ◽  
pp. 13970-13985
Author(s):  
Nuno Reis Conceição ◽  
Oksana V. Nesterova ◽  
Cyril Rajnák ◽  
Roman Boča ◽  
Armando J. L. Pombeiro ◽  
...  
Keyword(s):  
Single Molecule ◽  
Energy Barrier ◽  
High Energy ◽  
Single Molecule Magnets ◽  
New Members ◽  
High Energy Barrier ◽  
Tetranuclear Complexes

Three novel Mn4 and Mn11 complexes were synthesized and characterized. Tetranuclear complexes behave as single-molecule magnets with a high energy barrier.

Slow magnetic relaxation in dinuclear dysprosium and holmium phenoxide bridged complexes: a Dy2 single molecule magnet with a high energy barrier

2021 ◽  
Author(s):  
Matilde Fondo ◽  
Julio Corredoira-Vázquez ◽  
Ana M. Garcia-Deibe ◽  
Jesus Sanmartin Matalobos ◽  
Silvia Gómez-Coca ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Single Molecule ◽  
Energy Barrier ◽  
Magnetic Relaxation ◽  
High Energy ◽  
Single Molecule Magnet ◽  
High Energy Barrier ◽  
Slow Magnetic Relaxation

Dinuclear [M(H3L1,2,4)]2 (M = Dy, Dy2; M = Ho, Ho2) complexes were isolated from an heptadentate aminophenol ligand. The crystal structures of Dy2·2THF, and the pyridine adducts Dy2·2Py and Ho2·2Py,...

scholarly journals A Co-based single-molecule magnet confined in a barium phosphate apatite matrix with a high energy barrier for magnetization relaxation

2017 ◽  
Vol 53 (39) ◽  
pp. 5416-5419 ◽  
Author(s):  
Pavel E. Kazin ◽  
Mikhail A. Zykin ◽  
Lev A. Trusov ◽  
Artem A. Eliseev ◽  
Oxana V. Magdysyuk ◽  
...  
Keyword(s):  
High Spin ◽  
Single Molecule ◽  
Energy Barrier ◽  
High Energy ◽  
Magnetization Relaxation ◽  
Single Molecule Magnet ◽  
High Energy Barrier ◽  
Spin Reversal ◽  
Type Lattice ◽  
Apatite Type

A Co-ion introduced into the trigonal channel of an apatite-type lattice forms a magnetically anisotropic two-coordinated Co-complex with a record-high spin-reversal energy barrier.

“Isolated” DyO+ Embedded in a Ceramic Apatite Matrix Featuring Single-Molecule Magnet Behavior with a High Energy Barrier for Magnetization Relaxation

2017 ◽  
Vol 129 (43) ◽  
pp. 13601-13605 ◽  
Author(s):  
Pavel E. Kazin ◽  
Mikhail A. Zykin ◽  
Valentina V. Utochnikova ◽  
Oxana V. Magdysyuk ◽  
Alexander V. Vasiliev ◽  
...  
Keyword(s):  
Single Molecule ◽  
Energy Barrier ◽  
High Energy ◽  
Magnetization Relaxation ◽  
Single Molecule Magnet ◽  
High Energy Barrier

scholarly journals Hexanuclear [Cp*Dy]6 single-molecule magnet

2020 ◽  
Vol 56 (27) ◽  
pp. 3887-3890 ◽  
Author(s):  
Jianfeng Wu ◽  
Serhiy Demeshko ◽  
Sebastian Dechert ◽  
Franc Meyer
Keyword(s):  
Single Molecule ◽  
Energy Barrier ◽  
Magnetic Relaxation ◽  
Hysteresis Loops ◽  
High Energy ◽  
Single Molecule Magnet ◽  
High Energy Barrier

A hexanuclear cluster containing six {Cp*Dy} units shows a high energy barrier (Ueff = 561 K) for magnetic relaxation and butterfly-shaped hysteresis loops up to 4.5 K.

“Isolated” DyO+ Embedded in a Ceramic Apatite Matrix Featuring Single-Molecule Magnet Behavior with a High Energy Barrier for Magnetization Relaxation

2017 ◽  
Vol 56 (43) ◽  
pp. 13416-13420 ◽  
Author(s):  
Pavel E. Kazin ◽  
Mikhail A. Zykin ◽  
Valentina V. Utochnikova ◽  
Oxana V. Magdysyuk ◽  
Alexander V. Vasiliev ◽  
...  
Keyword(s):  
Single Molecule ◽  
Energy Barrier ◽  
High Energy ◽  
Magnetization Relaxation ◽  
Single Molecule Magnet ◽  
High Energy Barrier

Zero-Field Quantum Tunneling of the Magnetization in a Series of High Energy-Barrier Dysprosium (III) Single-Molecule Magnets

2018 ◽  
Author(s):  
Fabrizio Ortu ◽  
Daniel Reta ◽  
You-Song Ding ◽  
Conrad A. P. Goodwin ◽  
Matthew P. Gregson ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetic Hysteresis ◽  
High Energy ◽  
Exact Nature ◽  
Zero Field ◽  
Vibrational Modes ◽  
Single Molecule Magnets ◽  
Quantum Tunnelling ◽  
Intermediate Energies ◽  
High Energy Barrier

<p>Energy barriers to magnetisation reversal (U<sub>eff</sub>) in single-molecule magnets (SMMs) have vastly increased recently, but only for the dysprosocenium SMM [Dy(Cp<sup>ttt</sup>)<sub>2</sub>][B(C<sub>6</sub>F<sub>5</sub>)<sub>4</sub>] (Cp<sup>ttt</sup> = C<sub>5</sub>H<sub>2</sub><sup>t</sup>Bu<sub>3</sub>-1,2,4) has this translated into a considerable increase in magnetic hysteresis temperatures. The lack of concomitant increases in hysteresis temperatures with U<sub>eff</sub> values is due to efficient magnetic relaxation at zero-field, referred to as quantum tunnelling of the magnetisation (QTM); however, the exact nature of this phenomenon is unknown. Recent hypotheses suggest that both transverse dipolar magnetic fields and hyperfine coupling play a significant role in this process for Dy(III) SMMs. Here, by studying the compounds [Dy(<sup>t</sup>BuO)Cl(THF)<sub>5</sub>][BPh<sub>4</sub>] (<b>1</b>), [K(18-crown-6-ether)(THF)<sub>2</sub>][Dy(BIPM)<sub>2</sub>] (<b>2</b>, BIPM = C{PPh<sub>2</sub>NSiMe<sub>3</sub>}<sub>2</sub>), and [Dy(Cp<sup>ttt</sup>)<sub>2</sub>][B(C<sub>6</sub>F<sub>5</sub>)<sub>4</sub>] (<b>3</b>), we show conclusively that neither of these processes are the main contributor to zero-field QTM for Dy(III) SMMs, and suggest that its origin instead owes to molecular flexibility. By analysing the vibrational modes of the three molecules, we show that the modes that most impact the magnetic ion occur at the lowest energies for <b>1</b>, at intermediate energies for <b>2</b> and at higher energies for <b>3</b>, in correlation with their ability to retain magnetisation. Therefore, we conclude that SMM performance could be improved by employing more rigid ligands with higher-energy metal-ligand vibrational modes.</p>

Zero-Field Quantum Tunneling of the Magnetization in a Series of High Energy-Barrier Dysprosium (III) Single-Molecule Magnets

2018 ◽  
Author(s):  
Fabrizio Ortu ◽  
Daniel Reta ◽  
You-Song Ding ◽  
Conrad A. P. Goodwin ◽  
Matthew P. Gregson ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetic Hysteresis ◽  
High Energy ◽  
Exact Nature ◽  
Zero Field ◽  
Vibrational Modes ◽  
Single Molecule Magnets ◽  
Quantum Tunnelling ◽  
Intermediate Energies ◽  
High Energy Barrier

<p>Energy barriers to magnetisation reversal (U<sub>eff</sub>) in single-molecule magnets (SMMs) have vastly increased recently, but only for the dysprosocenium SMM [Dy(Cp<sup>ttt</sup>)<sub>2</sub>][B(C<sub>6</sub>F<sub>5</sub>)<sub>4</sub>] (Cp<sup>ttt</sup> = C<sub>5</sub>H<sub>2</sub><sup>t</sup>Bu<sub>3</sub>-1,2,4) has this translated into a considerable increase in magnetic hysteresis temperatures. The lack of concomitant increases in hysteresis temperatures with U<sub>eff</sub> values is due to efficient magnetic relaxation at zero-field, referred to as quantum tunnelling of the magnetisation (QTM); however, the exact nature of this phenomenon is unknown. Recent hypotheses suggest that both transverse dipolar magnetic fields and hyperfine coupling play a significant role in this process for Dy(III) SMMs. Here, by studying the compounds [Dy(<sup>t</sup>BuO)Cl(THF)<sub>5</sub>][BPh<sub>4</sub>] (<b>1</b>), [K(18-crown-6-ether)(THF)<sub>2</sub>][Dy(BIPM)<sub>2</sub>] (<b>2</b>, BIPM = C{PPh<sub>2</sub>NSiMe<sub>3</sub>}<sub>2</sub>), and [Dy(Cp<sup>ttt</sup>)<sub>2</sub>][B(C<sub>6</sub>F<sub>5</sub>)<sub>4</sub>] (<b>3</b>), we show conclusively that neither of these processes are the main contributor to zero-field QTM for Dy(III) SMMs, and suggest that its origin instead owes to molecular flexibility. By analysing the vibrational modes of the three molecules, we show that the modes that most impact the magnetic ion occur at the lowest energies for <b>1</b>, at intermediate energies for <b>2</b> and at higher energies for <b>3</b>, in correlation with their ability to retain magnetisation. Therefore, we conclude that SMM performance could be improved by employing more rigid ligands with higher-energy metal-ligand vibrational modes.</p>

Multiple magnetic relaxation processes, magnetocaloric effect and fluorescence properties of rhombus-shaped tetranuclear rare earth complexes

2016 ◽  
Vol 45 (1) ◽  
pp. 253-264 ◽  
Author(s):  
Hong-Ling Gao ◽  
Li Jiang ◽  
Shuang Liu ◽  
Hai-Yun Shen ◽  
Wen-Min Wang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Magnetocaloric Effect ◽  
Single Molecule ◽  
Energy Barrier ◽  
Magnetic Relaxation ◽  
High Energy ◽  
Rare Earth Complexes ◽  
Relaxation Processes ◽  
Single Molecule Magnet ◽  
High Energy Barrier

A multi-relaxation single-molecule magnet (SMM) of a {Dy4} complex exhibits two distinct relaxation processes, with a high energy barrier of 121 K.

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