scholarly journals Exceptionally slow magnetic relaxation in cobalt(ii) benzoate trihydrate

2018 ◽  
Vol 47 (43) ◽  
pp. 15523-15529 ◽  
Author(s):  
Anna Vráblová ◽  
Juraj Černák ◽  
Cyril Rajnák ◽  
Ľubor Dlháň ◽  
Milagros Tomás ◽  
...  
Keyword(s):  
Magnetic Relaxation ◽  
Ferromagnetic Coupling ◽  
Magnetic Studies ◽  
Slow Magnetic Relaxation ◽  
Positively Charged

Cobalt(ii) benzoate trihydrate possesses a positively charged chain of Co(ii) atoms triply linked by bridging benzoato and aqua ligands. Magnetic studies revealed ferromagnetic coupling between the Co(ii) atoms and slow magnetic relaxation with two relaxation channels.

Structures, fluorescence properties and magnetic properties of a series of rhombus-shaped LnIII4 clusters: magnetocaloric effect and single-molecule-magnet behavior

2019 ◽  
Vol 43 (33) ◽  
pp. 12941-12949 ◽  
Author(s):  
Wen-Min Wang ◽  
Li Zhang ◽  
Xian-Zhen Li ◽  
Li-Yuan He ◽  
Xin-Xin Wang ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetocaloric Effect ◽  
Single Molecule ◽  
Magnetic Relaxation ◽  
Magnetic Refrigeration ◽  
Fluorescence Properties ◽  
Relaxation Processes ◽  
Magnetic Studies ◽  
Single Molecule Magnet ◽  
Slow Magnetic Relaxation

A family LnIII4 clusters were successfully synthesized and structurally characterized. Magnetic studies show that Gd4 cluster displays magnetic refrigeration, while Dy4 cluster demonstrates two distinct slow magnetic relaxation processes.

A unusual two-dimensional azido-Cu(ii) network with benzoate derivative as a co-ligand exhibiting ferromagnetic order and slow magnetic relaxation

RSC Advances ◽  
2016 ◽  
Vol 6 (98) ◽  
pp. 96103-96108 ◽  
Author(s):  
Xiangyu Liu ◽  
Peipei Cen ◽  
Feifei Li ◽  
Xiaohui Ma ◽  
Huiliang Zhou ◽  
...  
Keyword(s):  
Magnetic Relaxation ◽  
Ferromagnetic Coupling ◽  
Two Dimensional ◽  
Ferromagnetic Order ◽  
Slow Magnetic Relaxation

A 2D layer-like Cu(ii) compound with multiple-bridges of azido, carboxylate and hydroxyl ligands, featuring strong ferromagnetic coupling and slow magnetic relaxation.

A Purely Lanthanide-Based Complex Exhibiting Ferromagnetic Coupling and Slow Magnetic Relaxation Behavior

2009 ◽  
Vol 48 (8) ◽  
pp. 3493-3495 ◽  
Author(s):  
Zhi Chen ◽  
Bin Zhao ◽  
Peng Cheng ◽  
Xiao-Qing Zhao ◽  
Wei Shi ◽  
...  
Keyword(s):  
Magnetic Relaxation ◽  
Relaxation Behavior ◽  
Ferromagnetic Coupling ◽  
Slow Magnetic Relaxation

Embedding 1D or 2D cobalt–carboxylate substrates in 3D coordination polymers exhibiting slow magnetic relaxation behaviors: crystal structures, high-field EPR, and magnetic studies

2017 ◽  
Vol 46 (14) ◽  
pp. 4786-4795 ◽  
Author(s):  
Nannan Mao ◽  
Biquan Zhang ◽  
Fan Yu ◽  
Xi Chen ◽  
Gui-lin Zhuang ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Crystal Structures ◽  
Coordination Polymers ◽  
Magnetic Relaxation ◽  
High Field ◽  
Magnetic Studies ◽  
Slow Magnetic Relaxation

A novel 3D coordination polymer containing 2D cobalt–carboxylate layer had been constructed, exhibiting slow magnetic relaxation.

Magnetic refrigeration and slow magnetic relaxation in tetranuclear lanthanide cages (Ln = Gd, Dy) with in situ ligand transformation

2014 ◽  
Vol 38 (7) ◽  
pp. 3006-3014 ◽  
Author(s):  
Javeed Ahmad Sheikh ◽  
Amit Adhikary ◽  
Sanjit Konar
Keyword(s):  
Magnetic Relaxation ◽  
Magnetic Refrigeration ◽  
Slow Relaxation ◽  
Magnetic Entropy ◽  
Magnetic Studies ◽  
Entropy Changes ◽  
Slow Magnetic Relaxation

Three tetranuclear lanthanide cages featuring either hemicubane (1 and 2) or distorted hemicubane (3) like cores are reported. Magnetic studies reveal significant magnetic entropy changes for complex 1 and a slow relaxation of magnetisation for 3.

The ferromagnetic [Ln2Co6] heterometallic complexes

2017 ◽  
Vol 46 (7) ◽  
pp. 2196-2203 ◽  
Author(s):  
Xiao-Qing Zhao ◽  
Jin Wang ◽  
Dong-Xu Bao ◽  
Shuo Xiang ◽  
Ya-Jun Liu ◽  
...  
Keyword(s):  
Magnetic Relaxation ◽  
Heterometallic Complexes ◽  
Ferromagnetic Coupling ◽  
Slow Magnetic Relaxation

Four 3d–4f [Ln2Co6] complexes were fabricated. [Dy2Co6] (1) and [Ho2Co6] (2) displayed ferromagnetic coupling, and [Dy2Co6] (1) exhibited slow magnetic relaxation.

Field-induced slow magnetic relaxation in mixed valence di- and tri-nuclear CoII–CoIII complexes

2020 ◽  
Vol 49 (27) ◽  
pp. 9516-9528 ◽  
Author(s):  
Aparup Paul ◽  
Marta Viciano-Chumillas ◽  
Horst Puschmann ◽  
Joan Cano ◽  
Subal Chandra Manna
Keyword(s):  
Low Temperature ◽  
Single Crystal ◽  
Magnetic Relaxation ◽  
Mixed Valence ◽  
X Ray Diffraction ◽  
Magnetic Studies ◽  
X Ray ◽  
Slow Magnetic Relaxation

Two novel mixed valence di/tri nuclear CoII–CoIII complexes were synthesized and characterized by single crystal X-ray diffraction. Magnetic studies at low temperature revealed that both complexes show slow magnetic relaxation.

scholarly journals Mononuclear Lanthanide(III)-Salicylideneaniline Complexes: Synthetic, Structural, Spectroscopic, and Magnetic Studies

2018 ◽  
Vol 4 (4) ◽  
pp. 45 ◽  
Author(s):  
Ioannis Mylonas-Margaritis ◽  
Diamantoula Maniaki ◽  
Julia Mayans ◽  
Laura Ciammaruchi ◽  
Vlasoula Bekiari ◽  
...  
Keyword(s):  
Magnetic Relaxation ◽  
Room Temperature ◽  
Green Light ◽  
Structural Features ◽  
Electromagnetic Spectrum ◽  
Magnetic Studies ◽  
Coordination Polyhedra ◽  
Imine Nitrogen ◽  
Slow Magnetic Relaxation ◽  
Oxygen Atoms

The reactions of hydrated lanthanide(III) [Ln(III)] nitrates and salicylideneaniline (salanH) have provided access to two families of mononuclear complexes depending on the reaction solvent used. In MeCN, the products are [Ln(NO3)3(salanH)2(H2O)]·MeCN, and, in MeOH, the products are [Ln(NO3)3(salanH)2(MeOH)]·(salanH). The complexes within each family are proven to be isomorphous. The structures of complexes [Ln(NO3)3(salanH)2(H2O)]·MeCN (Ln = Eu, 4·MeCN_Eu, Ln = Dy, 7·MeCN_Dy; Ln = Yb, 10·MeCN_Yb) and [Ln(NO3)3(salanH)2(MeOH)]·(salanH) (Ln = Tb, 17_Tb; Ln = Dy, 18_Dy) have been solved by single-crystal X-ray crystallography. In the five complexes, the LnIII center is bound to six oxygen atoms from the three bidentate chelating nitrato groups, two oxygen atoms from the two monodentate zwitterionic salanH ligands, and one oxygen atom from the coordinated H2O or MeOH group. The salanH ligands are mutually “cis” in 4·MeCN_Eu, 7·MeCN_Dy and 10·MeCN_Yb while they are “trans” in 17_Tb and 18_Dy. The lattice salanH molecule in 17_Tb and 18_Dy is also in its zwitterionic form with the acidic H atom being clearly located on the imine nitrogen atom. The coordination polyhedra defined by the nine oxygen donor atoms can be described as spherical tricapped trigonal prisms in 4·MeCN_Eu, 7·MeCN_Dy, and 10·MeCN_Yb and as spherical capped square antiprisms in 17_Tb and 18_Dy. Various intermolecular interactions build the crystal structures, which are completely different in the members of the two families. Solid-state IR data of the complexes are discussed in terms of their structural features. 1H NMR data for the diamagnetic Y(III) complexes provide strong evidence that the compounds decompose in DMSO by releasing the coordinated salanH ligands. The solid complexes emit green light upon excitation at 360 nm (room temperature) or 405 nm (room temperature). The emission is ligand-based. The solid Pr(III), Nd(III), Sm(III), Er(III), and Yb(III) complexes of both families exhibit LnIII-centered emission in the near-IR region of the electromagnetic spectrum, but there is probably no efficient salanH→LnIII energy transfer responsible for this emission. Detailed magnetic studies reveal that complexes 7·MeCN_Dy, 17_Tb and 18_Dy show field-induced slow magnetic relaxation while complex [Tb(NO3)3(salanH)2(H2O)]·MeCN (6·MeCN_Tb) does not display such properties. The values of the effective energy barrier for magnetization reversal are 13.1 cm−1 for 7·MeCN_Dy, 14.8 cm−1 for 17_Tb, and 31.0 cm−1 for 18_Dy. The enhanced/improved properties of 17_Tb and 18_Dy, compared to those of 6_Tb and 7_Dy, have been correlated with the different supramolecular structural features of the two families. The molecules [Ln(NO3)3(salanH)2(MeOH)] of complexes 17_Tb and 18_Dy are by far better isolated (allowing for better slow magnetic relaxation properties) than the molecules [Ln(NO3)3(salanH)2(H2O)] in 6·MeCN_Tb and 7·MeCN_Dy. The perspectives of the present initial studies in the Ln(III)/salanH chemistry are discussed.

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