Two isostructural Ln-MOFs showing luminescent sensing (Eu) and slow magnetic relaxation (Dy) properties

2018 ◽  
Vol 47 (44) ◽  
pp. 15656-15660 ◽  
Author(s):  
Chun Yang ◽  
Jie-Yu Zheng ◽  
Wen-Jing Cai ◽  
Fu-Sheng Guo ◽  
Yao-Yu Wang
Keyword(s):  
Energy Barrier ◽  
Magnetic Relaxation ◽  
Luminescence Properties ◽  
Ion Detection ◽  
Slow Magnetic Relaxation ◽  
The Eu ◽  
Luminescent Sensing

Two isostructural lanthanide-based MOFs are reported. The Eu-MOF exhibiting luminescence properties can be utilized in ion detection and the Dy-MOF displays SMM behavior with an energy barrier (ΔUeff) of 54 K.

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,...

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].

One-dimensional cobalt(ii) coordination polymer featuring single-ion-magnet-type field-induced slow magnetic relaxation

2018 ◽  
Vol 42 (12) ◽  
pp. 9612-9619 ◽  
Author(s):  
Xiangyu Liu ◽  
Xiufang Ma ◽  
Peipei Cen ◽  
Fengqing An ◽  
Zheng Wang ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Energy Barrier ◽  
Magnetic Relaxation ◽  
Easy Axis ◽  
One Dimensional ◽  
Slow Magnetic Relaxation

Single-ion-magnet-type field-induced double magnetic relaxation was observed in a one-dimensional cobalt(ii) coordination polymer which shows easy-axis anisotropy with D = −33.9 cm−1 and an energy barrier of Ueff = 38.8 K.

scholarly journals Slow magnetic relaxation in a {EuCu5} metallacrown

2019 ◽  
Vol 48 (5) ◽  
pp. 1686-1692 ◽  
Author(s):  
Jin Wang ◽  
Ze-Yu Ruan ◽  
Quan-Wen Li ◽  
Yan-Cong Chen ◽  
Guo-Zhang Huang ◽  
...  
Keyword(s):  
Ground State ◽  
Magnetic Relaxation ◽  
Relaxation Rates ◽  
Slow Magnetic Relaxation ◽  
The Eu

A {EuIIICu5} metallacrown displays field-induced slow magnetic relaxation, in which the EuIII with diamagnetic ground state enhances the relaxation rates.

Slow magnetic relaxation and luminescence properties in neodymium(iii)-4,4,4-trifluoro-1-(2-naphthyl)butane-1,3-dionato complexes incorporating bipyridyl ligands

2021 ◽  
Author(s):  
Ramon Vicente ◽  
Ànnia Tubau ◽  
Saskia Speed ◽  
Franz A. Mautner ◽  
Florian Bierbaumer ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetic Relaxation ◽  
Luminescence Properties ◽  
Molecular Materials ◽  
Single Molecule Magnets ◽  
Pyridyl Ligands ◽  
Slow Magnetic Relaxation

A new series of eight-coordinated Nd(iii) complexes derived from 4,4,4-trifluoro-1-(naphthalen-2-yl)butane-1,3-dionate and bi-pyridyl ligands revealed multifunctional molecular materials as photoluminescent single-molecule magnets (SMMs).

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.

A Dy2 dimer derived from a two-dimensional network with a high Ueff value

2019 ◽  
Vol 48 (8) ◽  
pp. 2560-2563 ◽  
Author(s):  
Ju-Wen Zhang ◽  
Yi Man ◽  
Wen-Hua Liu ◽  
Bin-Qiu Liu ◽  
Yan-Ping Dong
Keyword(s):  
Coordination Polymer ◽  
Hydrothermal Method ◽  
Energy Barrier ◽  
Magnetic Relaxation ◽  
Two Dimensional ◽  
Effective Energy ◽  
Ferromagnetic Interaction ◽  
Dimensional Network ◽  
Slow Magnetic Relaxation

A new two-dimensional dysprosium–organic coordination polymer 1-Dy has been synthesized by a hydrothermal method. 1-Dy displays a ferromagnetic interaction between two DyIII ions within the Dy2 dimer and a slow magnetic relaxation with a high effective energy barrier of approximately 160 K under a zero dc field.

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