A family of enantiopure FeIII4 single molecule magnets: fine tuning of energy barrier by remote substituent

2014 ◽  
Vol 43 (31) ◽  
pp. 11897-11907 ◽  
Author(s):  
Yuan-Yuan Zhu ◽  
Chang Cui ◽  
Kang Qian ◽  
Ji Yin ◽  
Bing-Wu Wang ◽  
...  
Keyword(s):  
Single Molecule ◽  
Energy Barrier ◽  
Fine Tuning ◽  
Single Molecule Magnets ◽  
New Family ◽  
Remote Substituent

We report a new family of enantiopure star-shaped FeIII4 single-molecule magnets (SMMs). Interestingly, the SMM properties of this series of clusters can be finely tuned by the remote substituent of the ligands.

Assembling two Dy2 single-molecule magnets with different energy barriers via fine-tuning the geometries of DyIII sites

2020 ◽  
Vol 44 (47) ◽  
pp. 20634-20642
Author(s):  
Dawei Li ◽  
Man-Man Ding ◽  
Yu Ge ◽  
David Felipe Tello Yepes ◽  
Mingyuan Sun ◽  
...  
Keyword(s):  
Single Molecule ◽  
Energy Barrier ◽  
Fine Tuning ◽  
Energy Barriers ◽  
Single Molecule Magnets

Two Dy2 single-molecule magnets are prepared. The energy barrier of 2 is slightly enhanced by adjusting the geometries of DyIII centers.

Fine-tuning terminal solvent ligands to rationally enhance the energy barrier in dinuclear dysprosium single-molecule magnets

2017 ◽  
Vol 46 (1) ◽  
pp. 186-192 ◽  
Author(s):  
Kun Zhang ◽  
Chen Yuan ◽  
Fu-Sheng Guo ◽  
Yi-Quan Zhang ◽  
Yao-Yu Wang
Keyword(s):  
Single Molecule ◽  
Energy Barrier ◽  
Fine Tuning ◽  
Hydrogen Atoms ◽  
Single Molecule Magnets

By replacing hydrogen atoms with electron-donating group on terminal solvent ligands, we were able to create a three-fold enhancement of the energy barrier in two dinuclear dysprosium single-molecule magnets.

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.

Structural anisotropy of cyanido-bridged {CoII9WV6} single-molecule magnets induced by bidentate ligands: towards the rational enhancement of an energy barrier

2016 ◽  
Vol 52 (26) ◽  
pp. 4772-4775 ◽  
Author(s):  
Szymon Chorazy ◽  
Michał Rams ◽  
Anna Hoczek ◽  
Bernard Czarnecki ◽  
Barbara Sieklucka ◽  
...  
Keyword(s):  
Single Molecule ◽  
Energy Barrier ◽  
Magnetic Relaxation ◽  
Bidentate Ligands ◽  
Single Molecule Magnets ◽  
Structural Anisotropy ◽  
Slow Magnetic Relaxation

{CoII9[WV(CN)8]6} clusters capped by odd and even number of bidentate ligands reveal the improved slow magnetic relaxation due to the significant structural anisotropy.

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].

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 Energy-Barrier Enhancement by Ligand Substitution in Tetrairon(III) Single-Molecule Magnets

2004 ◽  
Vol 116 (9) ◽  
pp. 1156-1159 ◽  
Author(s):  
Andrea Cornia ◽  
Antonio C. Fabretti ◽  
Pierfrancesco Garrisi ◽  
Cecilia Mortalò ◽  
Daniele Bonacchi ◽  
...  
Keyword(s):  
Single Molecule ◽  
Energy Barrier ◽  
Ligand Substitution ◽  
Single Molecule Magnets
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