High local coordination symmetry around the spin center and the alignment between magnetic and symmetric axes together play a crucial role in single-molecule magnet performance

2019 ◽  
Vol 48 (15) ◽  
pp. 4931-4940 ◽  
Author(s):  
Zhao-Fu Yang ◽  
Yong-Mei Tian ◽  
Wan-Ying Zhang ◽  
Peng Chen ◽  
Hong-Feng Li ◽  
...  
Keyword(s):  
Single Molecule ◽  
Crucial Role ◽  
Pentagonal Bipyramid ◽  
Coordination Geometry ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet ◽  
Local Coordination ◽  
Spin Center

A tetradentate 8-hydroxyquinoline-based acyl hydrazine ligand was used to construct a series of mono/di-nuclear dysprosium single-molecule magnets (SMMs) with nearly ideal pentagonal bipyramid coordination geometry (D5h).

Carboxylate-Bridged Dinuclear Dy2 Single-Molecule Magnets: Synthesis, Structure, and Magnetic Studies

2013 ◽  
Vol 66 (1) ◽  
pp. 98 ◽  
Author(s):  
Yu-mei Song ◽  
Feng Luo ◽  
Yan Zhu ◽  
Xiao-zhao Tian ◽  
Gong-ming Sun
Keyword(s):  
Magnetic Properties ◽  
Single Molecule ◽  
Coordination Geometry ◽  
Magnetic Studies ◽  
Single Molecule Magnets ◽  
Chlorobenzoic Acid ◽  
Ferromagnetic Interaction ◽  
Single Molecule Magnet ◽  
The Difference

In this work, the synthesis, structure, and magnetic studies of three dinuclear Dy2 compounds, namely Dy2(bpy)2(L)6 (1), Dy2(phen)2(L)6 (2), Dy2(μ-H2O)2(bpy)2(L)6 (3) are reported in detail, where HL, phen, and bpy are 4-chlorobenzoic acid, 1,10-phenanthroline, and 2,2′-bipyridine. Magnetic studies reveal the intramolecular ferromagnetic interaction and single-molecule magnetic properties of these compounds. The fine-tuned single-molecule magnet properties of compounds 1–3, mainly due to the difference of the coordination geometry of DyIII ions, are highlighted.

Seeking Magneto-Structural Correlations in Easily Tailored Pentagonal Bipyramid Dy(III) Single-Ion Magnets

2019 ◽  
Author(s):  
Guo-Zhang Huang ◽  
Ze-Yu Ruan ◽  
Jie-Yu Zheng ◽  
Yan-Cong Chen ◽  
Si-Guo Wu ◽  
...  
Keyword(s):  
Single Molecule ◽  
Structural Engineering ◽  
Magnetic Hysteresis ◽  
Sweep Rate ◽  
Coordination Bond ◽  
Pentagonal Bipyramid ◽  
Single Molecule Magnets ◽  
Crystal Field Theory ◽  
Bond Angles ◽  
Axial Coordination

<p><a></a>Controlling molecular magnetic anisotropy via structural engineering is delicate and fascinating, especially for single-molecule magnets (SMMs). Herein a family of dysprosium single-ion magnets (SIMs) sitting in pentagonal bipyramid geometry have been synthesized with the variable-size terminal ligands and counter anions, through which the subtle coordination geometry of Dy(III) can be finely tuned based on the size effect. The effective energy barrier (Ueff) successfully increases from 439 K to 632 K and the magnetic hysteresis temperature (under a 200 Oe/s sweep rate) raises from 11 K to 24 K. Based on the crystal-field theory, a semi-quantitative magneto-structural correlation deducing experimentally for the first time is revealed that the Ueff is linearly proportional to the structural-related value S2<sup>0</sup> corresponding to the axial coordination bond lengths and the bond angles. Through the evaluation of the remanent magnetization from hysteresis, quantum tunneling of magnetization (QTM) is found to exhibit negative correlation with the structural-related value S<sub>tun</sub> corresponding to the axial coordination bond angles.<br></p>

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.

scholarly journals High-Coordinate Mononuclear Ln(III) Complexes: Synthetic Strategies and Magnetic Properties

2020 ◽  
Vol 7 (1) ◽  
pp. 1
Author(s):  
Joydev Acharya ◽  
Pankaj Kalita ◽  
Vadapalli Chandrasekhar
Keyword(s):  
Magnetic Properties ◽  
Single Molecule ◽  
Fine Tuning ◽  
Coordination Geometry ◽  
Single Molecule Magnets ◽  
Magnetization Relaxation ◽  
Quantum Tunneling Of Magnetization ◽  
Structural Correlation ◽  
High Coordination Number ◽  
High Coordination

Single-molecule magnets involving monometallic 4f complexes have been investigated extensively in last two decades to understand the factors that govern the slow magnetization relaxation behavior in these complexes and to establish a magneto-structural correlation. The prime goal in this direction is to suppress the temperature independent quantum tunneling of magnetization (QTM) effect via fine-tuning the coordination geometry/microenvironment. Among the various coordination geometries that have been pursued, complexes containing high coordination number around Ln(III) are sparse. Herein, we present a summary of the various synthetic strategies that were used for the assembly of 10- and 12-coordinated Ln(III) complexes. The magnetic properties of such complexes are also described.

Recent advances in lanthanide coordination polymers and clusters with magnetocaloric effect or single-molecule magnet behavior

2021 ◽  
Author(s):  
Jun-Jie Hu ◽  
Yan Peng ◽  
Sui-Jun Liu ◽  
He-Rui Wen
Keyword(s):  
Quantum Computing ◽  
Low Temperature ◽  
Magnetocaloric Effect ◽  
Coordination Polymers ◽  
Single Molecule ◽  
Information Storage ◽  
Lanthanide Ions ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet ◽  
Lanthanide Coordination Polymers

The molecular magnetorefrigerant materials for low-temperature magnetic refrigeration and single-molecule magnets for high-density information storage and quantum computing have received extensive attention from chemists and magnetic experts. Lanthanide ions with...

Polyoxometalate-Supported Lanthanoid Single-Molecule Magnets

2014 ◽  
Vol 67 (11) ◽  
pp. 1542 ◽  
Author(s):  
Michele Vonci ◽  
Colette Boskovic
Keyword(s):  
Single Molecule ◽  
Energy Barrier ◽  
Magnetic Relaxation ◽  
Donor Ligands ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet ◽  
Coordination Numbers ◽  
Oxygen Donor ◽  
Slow Magnetic Relaxation

Polyoxometalates are robust and versatile multidentate oxygen-donor ligands, eminently suitable for coordination to trivalent lanthanoid ions. To date, 10 very different structural families of such complexes have been found to exhibit slow magnetic relaxation due to single-molecule magnet (SMM) behaviour associated with the lanthanoid ions. These families encompass complexes with between one and four of the later lanthanoid ions: Tb, Dy, Ho, Er, and Yb. The lanthanoid coordination numbers vary between six and eleven and a range of coordination geometries are evident. The highest energy barrier to magnetisation reversal measured to date for a lanthanoid–polyoxometalate SMM is Ueff/kB = 73 K for the heterodinuclear Dy–Eu compound (Bu4N)8H4[DyEu(OH)2(γ-SiW10O36)2].

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.

scholarly journals Fulvalene as a platform for the synthesis of a dimetallic dysprosocenium single-molecule magnet

2020 ◽  
Vol 11 (22) ◽  
pp. 5745-5752 ◽  
Author(s):  
Mian He ◽  
Fu-Sheng Guo ◽  
Jinkui Tang ◽  
Akseli Mansikkamäki ◽  
Richard A. Layfield
Keyword(s):  
Single Molecule ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet

A series of fulvalene-supported dimetallic dysprosium metallocene SMMs provides a roadmap to poly-cationic dysprosocenium single-molecule magnets.

Geometry and magnetic interaction modulations in dinuclear Dy2 single-molecule magnets

2017 ◽  
Vol 46 (25) ◽  
pp. 8252-8258 ◽  
Author(s):  
Mei Guo ◽  
Yonghui Xu ◽  
Jianfeng Wu ◽  
Lang Zhao ◽  
Jinkui Tang
Keyword(s):  
Single Molecule ◽  
Magnetic Interaction ◽  
Coordination Geometry ◽  
Single Molecule Magnets

A series of dinuclear dysprosium compounds were synthesized, in which compound 3 combines the bridging modes of 1 and coordination geometry of 2, resulting in better SMM performance.

A family of novel Mn3Ln4 clusters displaying single-molecule magnet behavior

2014 ◽  
Vol 43 (44) ◽  
pp. 16737-16744 ◽  
Author(s):  
Hui Chen ◽  
Cheng-Bing Ma ◽  
Ming-Qiang Hu ◽  
Hui-Min Wen ◽  
Chang-Neng Chen
Keyword(s):  
Single Molecule ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet

A family of novel Mn3Ln4 clusters: single-molecule magnets and the first structurally characterized 3d/4f clusters containing the 3-methyloxysalicylaldoximate ligand.

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