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

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

2004 ◽  
Vol 43 (9) ◽  
pp. 1136-1139 ◽  
Author(s):  
Andrea Cornia ◽  
Antonio C. Fabretti ◽  
Pierfrancesco Garrisi ◽  
Cecilia Mortalò ◽  
Daniele Bonacchi ◽  
...  
Keyword(s):  
Single Molecule ◽  
Energy Barrier ◽  
Ligand Substitution ◽  
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.

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.

Anisotropy barrier enhancement via ligand substitution in tetranuclear {CoIII2LnIII2} single molecule magnets

2013 ◽  
Vol 49 (62) ◽  
pp. 6965 ◽  
Author(s):  
Stuart K. Langley ◽  
Nicholas F. Chilton ◽  
Boujemaa Moubaraki ◽  
Keith S. Murray
Keyword(s):  
Single Molecule ◽  
Ligand Substitution ◽  
Single Molecule Magnets

D4h Local Symmetric dysprosium(III) Single-Molecule Magnet with Energy Barrier Exceeding 2000 K

2020 ◽  
Author(s):  
Xia-Li Ding ◽  
Yuan-Qi Zhai ◽  
Tian Han ◽  
Wei-Peng Chen ◽  
You-Song Ding ◽  
...  
Keyword(s):  
Single Molecule ◽  
Energy Barrier ◽  
Local Symmetry ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet ◽  
The Third ◽  
Type Symmetry

<p><a></a><a></a><a><b>Three six-coordinate Dy(III) single-molecule magnets (SMMs) [Dy(O<sup>t</sup>Bu)<sub>2</sub>(L)<sub>4</sub>]<sup>+</sup> with <i>D</i><sub>4h</sub> local symmetry are obtained by optimising the equatorial ligands. Compound 1 where L = 4-phenylpyridine shows an energy barrier (<i>U</i><sub>eff</sub>) of 2075(11) K, which is the third largest <i>U</i><sub>eff</sub>, and the first <i>U</i><sub>eff</sub> > 2000 K for SMMs with axial-type symmetry so far.</b></a></p>

A remarkable energy barrier for spin reversal in a field induced dinuclear ytterbium single molecule magnet

2021 ◽  
Vol 50 (39) ◽  
pp. 13666-13670
Author(s):  
Arpan Mondal ◽  
Sanjit Konar
Keyword(s):  
Single Molecule ◽  
Energy Barrier ◽  
Slow Relaxation ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet ◽  
Crystal Fields ◽  
Spin Reversal

Strong equatorial and weak axial crystal fields enhance the energy barrier for slow relaxation of magnetization in Yb-based single molecule magnets.

Six-coordinate mononuclear dysprosium(iii) single-molecule magnets with the triphenylphosphine oxide ligand

2020 ◽  
Vol 49 (15) ◽  
pp. 4694-4698
Author(s):  
Kuduva R. Vignesh ◽  
Dimitris I. Alexandropoulos ◽  
Haomiao Xie ◽  
Kim R. Dunbar
Keyword(s):  
Ab Initio ◽  
Single Molecule ◽  
Energy Barrier ◽  
Triphenylphosphine Oxide ◽  
Single Molecule Magnets ◽  
Analogous Complex ◽  
Halide Ligands

Three rare octahedral mononuclear DyIII complexes bearing triphenylphosphine oxide and halide ligands are reported. The Cl− and Br− analogues exhibit SMM behavior under a small dc field. Ab initio CASSCF calculations reveal a higher energy barrier for an analogous complex with iodides.

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