scholarly journals Tetraanionic Biphenyl Lanthanide Complexes as Single-Molecule Magnets

2015 ◽  
Vol 54 (5) ◽  
pp. 2374-2382 ◽  
Author(s):  
Wenliang Huang ◽  
Jennifer J. Le Roy ◽  
Saeed I. Khan ◽  
Liviu Ungur ◽  
Muralee Murugesu ◽  
...  
Keyword(s):  
Single Molecule ◽  
Lanthanide Complexes ◽  
Single Molecule Magnets

Combination of single-molecule magnet behaviour and luminescence properties in a new series of lanthanide complexes with tris(pyrazolyl)borate and oligo(β-diketonate) ligands

2020 ◽  
Vol 49 (23) ◽  
pp. 7774-7789 ◽  
Author(s):  
Elena A. Mikhalyova ◽  
Matthias Zeller ◽  
Jerry P. Jasinski ◽  
Raymond J. Butcher ◽  
Luca M. Carrella ◽  
...  
Keyword(s):  
Single Molecule ◽  
Lanthanide Complexes ◽  
Ternary Complexes ◽  
Luminescence Properties ◽  
Quantum Yields ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet

Mono-, di- & trinuclear ternary complexes of Dy3+ & Tb3+ with pyrazole & oligo-diketonates are both luminescent and single molecule magnets. Quantum yields & Ueff values decrease with higher nuclearity & reduced intramolecular Ln–Ln distance.

scholarly journals Series of Chloranilate-Bridged Dinuclear Lanthanide Complexes: Kramers Systems Showing Field-Induced Slow Magnetic Relaxation

2019 ◽  
Vol 5 (2) ◽  
pp. 30 ◽  
Author(s):  
Ryuta Ishikawa ◽  
Shoichi Michiwaki ◽  
Takeshi Noda ◽  
Keiichi Katoh ◽  
Masahiro Yamashita ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Single Molecule ◽  
Magnetic Relaxation ◽  
Lanthanide Complexes ◽  
Relaxation Processes ◽  
X Ray Diffraction ◽  
Single Molecule Magnets ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Slow Magnetic Relaxation

A series of chloralilate-bridged dinuclear lanthanide complexes of formula [{LnIII(Tp)2}2(μ-Cl2An)]·2CH2Cl2, where Cl2An2− and Tp− represent the chloranilate and hydrotris (pyrazolyl)borate ligands, respectively, and Ln = Gd (1), Tb (2), Ho (3), Er (4), and Yb (5) was synthesized. All five complexes were characterized by an elemental analysis, infrared spectroscopy, single crystal X-ray diffraction, and SQUID measurements. The complexes 1–5 in the series were all isostructural. A comparison of the temperature dependence of the dc magnetic susceptibility data of these complexes revealed clear differences depending on the lanthanide center. Ac magnetic susceptibility measurements revealed that none of the five complexes exhibited a slow magnetic relaxation under a zero applied dc field. On the other hand, the Kramers systems (complexes 4 and 5) clearly displayed a slow magnetic relaxation under applied dc fields, suggesting field-induced single-molecule magnets that occur through Orbach and Raman relaxation processes.

Single molecule magnetic behaviour in lanthanide naphthalenesulfonate complexes

2018 ◽  
Vol 47 (48) ◽  
pp. 17349-17356 ◽  
Author(s):  
Guo Peng ◽  
Ying-Ying Zhang ◽  
Bo Li ◽  
Xiao-Fan Sun ◽  
Hong-Ling Cai ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetic Relaxation ◽  
Lanthanide Complexes ◽  
Magnetic Behaviour ◽  
Single Molecule Magnets ◽  
Slow Magnetic Relaxation

A family of mononuclear lanthanide complexes exhibiting slow magnetic relaxation is reported, providing the first examples of pure 4f sulfonate-based single molecule magnets.

A series of counter cation dependent tetra β-diketonate mononuclear lanthanide(III) single-molecule magnets and immobilization on pre-functionalised GaN substrates by anion exchange reaction

2021 ◽  
Author(s):  
Zhuo Wu ◽  
Yong-Mei Tian ◽  
Peng Chen ◽  
Wenbin Sun ◽  
Bingwu Wang ◽  
...  
Keyword(s):  
Exchange Reaction ◽  
Anion Exchange ◽  
Single Molecule ◽  
Lanthanide Complexes ◽  
Single Molecule Magnets ◽  
Counter Cation ◽  
Anion Exchange Reaction

A series of mononuclear lanthanide complexes with formula [Hex4N][Ln(DBM)4] (1Ln) (Ln = Nd and Tb), [But4N][Dy(DBM)4] (2), [Et4N][Dy(DBM)4] (3), [PhCH2N(CH3)3][Dy(DBM)4] (4) and [Hex4N][Dy(TTA)4 (5) formed by four β-diketonate ligands (i.e....

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.

A Combined Spin-Flip and IP/EA Approach for Handling Spin and Spatial Degeneracies: Application to Double Exchange Systems

2018 ◽  
Author(s):  
Shannon Houck ◽  
Nicholas Mayhall
Keyword(s):  
Single Molecule ◽  
Double Exchange ◽  
Computational Effort ◽  
Strongly Correlated ◽  
Single Molecule Magnets ◽  
New Approach ◽  
Spin Flip ◽  
Model Hamiltonian ◽  
Simultaneous Existence ◽  
Exchange Parameters

<div>Many multiconfigurational systems, such as single-molecule magnets, are difficult to study using traditional computational methods due to the simultaneous existence of both spin and spatial degeneracies. In this work, a new approach termed n-spin-flip Ionization Potential/Electron Affinity (<i>n</i>SF-IP or <i>n</i>SF-EA) is introduced which combines the spin-flip method of Anna Krylov with particle-number changing IP/EA methods. We demonstrate the efficacy of the approach by applying it to the strongly-correlated N<sub>2</sub><sup>+</sup> as well as several double exchange systems. We also demonstrate that when these systems are well-described by a double exchange model Hamiltonian, only 1SF-IP/EA is required to extract the double exchange parameters and accurately predict energies for the low-spin states. This significantly reduces the computational effort for studying such systems. The effects of including additional excitations (using a RAS-<i>n</i>SF-IP/EA scheme) are also examined, with particular emphasis on hole and particle excitations.</div>

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