scholarly journals Implementation of slow magnetic relaxation in a SIM-MOF through a structural rearrangement

2018 ◽  
Vol 47 (41) ◽  
pp. 14734-14740 ◽  
Author(s):  
Javier Castells-Gil ◽  
José J. Baldoví ◽  
Carlos Martí-Gastaldo ◽  
Guillermo Mínguez Espallargas
Keyword(s):  
Charge Density ◽  
Magnetic Relaxation ◽  
Structural Rearrangement ◽  
Coordination Environment ◽  
Slow Magnetic Relaxation

Dehydration of a Dy-based MOF causes the appearance of slow-magnetic relaxation due to the changes of the charge density of the coordination environment.

scholarly journals Implementation of Slow Magnetic Relaxation in a SIM-MOF Through a Structural Rearrangement

2018 ◽  
Author(s):  
Guillermo Minguez Espallargas ◽  
Javier Castells-Gil ◽  
Carlos Marti-Gastaldo ◽  
Jose J. Baldovi
Keyword(s):  
Magnetic Properties ◽  
Charge Density ◽  
Magnetic Relaxation ◽  
Structural Rearrangement ◽  
Ligand Substitution ◽  
Structural Flexibility ◽  
Coordination Environment ◽  
Substitution Process ◽  
Slow Magnetic Relaxation

<p>Here we report the structural flexibility of a Dy-based Single-Ion Magnet MOF in which its magnetic properties can be modified through a ligand substitution process involving an increase of the charge density of the coordination environment.</p>

scholarly journals Implementation of Slow Magnetic Relaxation in a SIM-MOF Through a Structural Rearrangement

2018 ◽  
Author(s):  
Guillermo Minguez Espallargas ◽  
Javier Castells-Gil ◽  
Carlos Marti-Gastaldo ◽  
Jose J. Baldovi
Keyword(s):  
Magnetic Properties ◽  
Charge Density ◽  
Magnetic Relaxation ◽  
Structural Rearrangement ◽  
Ligand Substitution ◽  
Structural Flexibility ◽  
Coordination Environment ◽  
Substitution Process ◽  
Slow Magnetic Relaxation

<p>Here we report the structural flexibility of a Dy-based Single-Ion Magnet MOF in which its magnetic properties can be modified through a ligand substitution process involving an increase of the charge density of the coordination environment.</p>

Switching of Slow Magnetic Relaxation Dynamics in Mononuclear Dysprosium(III) Compounds with Charge Density

2016 ◽  
Vol 55 (11) ◽  
pp. 5398-5404 ◽  
Author(s):  
Kwang Soo Lim ◽  
José J. Baldoví ◽  
Woo Ram Lee ◽  
Jeong Hwa Song ◽  
Sung Won Yoon ◽  
...  
Keyword(s):  
Charge Density ◽  
Magnetic Relaxation ◽  
Relaxation Dynamics ◽  
Slow Magnetic Relaxation

Dinuclear Lanthanide–Carboxylate Compounds: Field-Induced Slow Relaxation of Magnetization for Dysprosium(III) Analogue

2015 ◽  
Vol 68 (3) ◽  
pp. 488 ◽  
Author(s):  
Yi-Lei Li ◽  
Qing-Yan Liu ◽  
Cai-Ming Liu ◽  
Yu-Ling Wang ◽  
Ling Chen
Keyword(s):  
Energy Barrier ◽  
Magnetic Relaxation ◽  
Applied Field ◽  
Antiferromagnetic Interaction ◽  
Slow Relaxation ◽  
Phen Ligand ◽  
Exponential Factor ◽  
Coordination Environment ◽  
Carboxylate Groups ◽  
Slow Magnetic Relaxation

Three chiral dinuclear lanthanide compounds, Ln2(µ2-L)4(L)2(phen)2 (Ln = Dy (1), Gd (2), and Er (3); phen = 1,10-phenanthroline), have been synthesized using the (S)-(+)-2-(6-methoxy-2-naphthyl)propionic acid (HL) ligand. The two lanthanide centres in compound Ln2(µ2-L)4(L)2(phen)2 are bridged by four carboxylate groups to give a dinuclear Ln2(µ2-L)4 core. The square antiprismatic coordination environment for each lanthanide centre is further completed by a chelating carboxylate group from another L– ligand and two nitrogen atoms from the phen ligand. A weak antiferromagnetic interaction between the two GdIII ions is observed in compound 2. The Dy analogue displays field-induced slow magnetic relaxation behaviour with an effective energy barrier Ueff/k of 17.24(2) K and a pre-exponential factor τ0 of 2.7(1) × 10–6 s. However, no slow relaxation phenomenon was observed for the Er derivative even in the presence of 2 kOe applied field.

Influence of the coordination environment on slow magnetic relaxation and photoluminescence behavior in two mononuclear dysprosium(iii) based single molecule magnets

2015 ◽  
Vol 44 (11) ◽  
pp. 5086-5094 ◽  
Author(s):  
Amit Kumar Mondal ◽  
Soumyabrata Goswami ◽  
Sanjit Konar
Keyword(s):  
Single Molecule ◽  
Magnetic Relaxation ◽  
Local Symmetry ◽  
Quantum Yields ◽  
Slight Variation ◽  
Single Molecule Magnets ◽  
Coordination Environment ◽  
Photoluminescence Study ◽  
Slow Magnetic Relaxation ◽  
Photoluminescence Behavior

Two luminescent mononuclear Dy(iii) based complexes with SMM behaviour have been reported. The SMM behaviours differ due to the slight variation of local symmetry around the Dy(iii) centers and photoluminescence study showed quantum yields of 0.98 and 1.44%.

scholarly journals Counterintuitive Single-Molecule Magnet Behaviour in Two Polymorphs of One-Dimensional Compounds Involving Chiral BINOL-Derived Bisphosphate Ligands

2021 ◽  
Vol 7 (11) ◽  
pp. 150
Author(s):  
Carlo Andrea Mattei ◽  
Bertrand Lefeuvre ◽  
Vincent Dorcet ◽  
Gilles Argouarch ◽  
Olivier Cador ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetic Relaxation ◽  
Magnetic Measurements ◽  
Solvent Mixture ◽  
Zero Field ◽  
Coordination Environment ◽  
Single Molecule Magnet ◽  
One Dimensional ◽  
Slow Magnetic Relaxation ◽  
Coordination Reaction

The coordination reaction of the [Dy(hfac)3(H2O)2] units (hfac− = 1,1,1,5,5,5-hexafluoroacetylacetonate) with the [8′-(Diphenoxylphosphinyl)[1,1′-binaphthalen]-8-yl]diphenoxylphosphine oxide ligand (L) followed by a crystallisation in a 1:3 CH2Cl2:n-hexane solvent mixture led to the isolation of a new polymorph of formula [(Dy(hfac)3((S)-L))3]n (1). The X-ray structure on single crystal of 1 revealed the formation of a mono-dimensional coordination polymer with three crystallographically independent DyIII centres, which crystallised in the polar chiral P21 space group. Ac magnetic measurements highlighted single-molecule magnet behaviour under both zero and 1000 Oe applied magnetic field with magnetic relaxation through quantum tunneling of the magnetisation (QTM, zero field only) and Raman processes. Despite the three crystallographically independent DyIII centres adopting a distorted D4d coordination environment, a single slow magnetic relaxation contribution was observed at a slower rate than its previously studied [(Dy(hfac)3((S)-L))]n (2) polymorph.

Correlating the axial Zero Field Splitting with the slow magnetic relaxation in GdIII SIMs

2021 ◽  
Author(s):  
Júlia Mayans ◽  
Albert Escuer
Keyword(s):  
Magnetic Relaxation ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Slow Magnetic Relaxation

A possible relation between the value of the axial Zero Field Splitting and the occurrence of field-induced slow magnetic relaxation has been established for a new gadolinium(iii) compound.

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 Reciprocating Thermal Behavior in Multichannel Relaxation of Cobalt(II) Based Single Ion Magnets

2021 ◽  
Vol 7 (6) ◽  
pp. 76
Author(s):  
Cyril Rajnák ◽  
Ján Titiš ◽  
Roman Boča
Keyword(s):  
Thermal Behavior ◽  
Magnetic Relaxation ◽  
Additional Term ◽  
Negative Temperature ◽  
Point Of View ◽  
Magnetic Data ◽  
Phonon Bottleneck ◽  
Slow Magnetic Relaxation ◽  
Relaxation Channel ◽  
Frequency Relaxation

A series of mononuclear Co(II) complexes showing slow magnetic relaxation is assessed from the point of view of relaxation mechanisms. In certain cases, the reciprocating thermal behavior is detected: On cooling, the slow relaxation time is prolonged until a certain limit and then, unexpectedly, is accelerated. The low-temperature magnetic data can be successfully fitted by assuming Raman and/or phonon bottleneck mechanisms of the slow magnetic relaxation for the high-frequency relaxation channel. An additional term with the negative temperature exponent is capable of reproducing the whole experimental dataset.

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