scholarly journals Nitronyl Nitroxide Biradical-Based Binuclear Lanthanide Complexes: Structure and Magnetic Properties

2020 ◽  
Vol 6 (4) ◽  
pp. 48
Author(s):  
Lu Xi ◽  
Jing Han ◽  
Xiaohui Huang ◽  
Licun Li
Keyword(s):  
Magnetic Properties ◽  
Magnetic Relaxation ◽  
Lanthanide Complexes ◽  
Magnetic Data ◽  
Antiferromagnetic Coupling ◽  
Zero Field ◽  
Nitronyl Nitroxide ◽  
Ferromagnetic Exchange ◽  
Binuclear Structure ◽  
Slow Magnetic Relaxation

Employing a new nitronyl nitroxide biradical NITPhPzbis(NITPhPzbis = 5-(1-pyrazolyl)-1,3-bis(1’-oxyl-3’-oxido-4’,4’,5’,5’-tetramethyl-4,5-hydro-1H-imidazol-2-yl)benzene), a series of 2p-4f complexes [Ln2(hfac)6(H2O)(NITPhPzbis)] (LnIII = Gd1, Tb2, Dy3; hfac = hexafluoroacetylacetonate) were successfully synthesized. In complexes 1–3, the designed biradical NITPhPzbis coordinates with two LnIII ions in chelating and bridging modes to form a four-spin binuclear structure. Direct-current magnetic study of Gd analogue indicates that ferromagnetic exchange exists between the Gd ion and the radical while antiferromagnetic coupling dominates between two mono-radicals. Dynamic magnetic data show that the χ” signals of complex 3 exhibit frequency dependence under zero field, demonstrating slow magnetic relaxation behavior in complex 3. And the estimated values of Ueff and τ0 are about 8.4 K and 9.1 × 10−8 s, respectively.

Syntheses and magnetic properties of a bis-tridentate nitronyl nitroxide radical and its metal complexes

2019 ◽  
Vol 48 (15) ◽  
pp. 4774-4778 ◽  
Author(s):  
Hao Miao ◽  
Miao Li ◽  
Hong-Qing Li ◽  
Fu-Xing Shen ◽  
Yi-Quan Zhang ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Metal Complexes ◽  
Magnetic Relaxation ◽  
Nitroxide Radical ◽  
Nitronyl Nitroxide ◽  
Nitronyl Nitroxide Radical ◽  
Slow Magnetic Relaxation

A new bis-tridentate nitronyl nitroxide radical was synthesized and characterized. Field-induced slow magnetic relaxation was observed in the radical-bridged CoII complex.

Unusual Gd–nitronyl nitroxide antiferromagnetic coupling and slow magnetic relaxation in the corresponding Tb analogue

2015 ◽  
Vol 44 (31) ◽  
pp. 13890-13896 ◽  
Author(s):  
Xiufeng Wang ◽  
Mei Zhu ◽  
Juanjuan Wang ◽  
Licun Li
Keyword(s):  
Magnetic Relaxation ◽  
Antiferromagnetic Interaction ◽  
Antiferromagnetic Coupling ◽  
Nitronyl Nitroxide ◽  
Radical Complex ◽  
Slow Magnetic Relaxation

An unusual antiferromagnetic interaction was observed in a Gd–radical complex with tridentate chelating nitronyl nitroxide. The Tb complex displays slow magnetic relaxation.

Structures, luminescent and magnetic properties of three dinuclear lanthanide complexes: Dysprosium compound displaying slow magnetic relaxation

Polyhedron ◽  
2019 ◽  
Vol 157 ◽  
pp. 530-535
Author(s):  
Ming Fang ◽  
Ying-Ying Chen ◽  
Li-Jun Shao ◽  
Tian-Xing Shi ◽  
Hong Yu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Relaxation ◽  
Lanthanide Complexes ◽  
Slow Magnetic Relaxation

A new family of dinuclear lanthanide complexes constructed from an 8-hydroxyquinoline Schiff base and β-diketone: magnetic properties and near-infrared luminescence

2019 ◽  
Vol 48 (4) ◽  
pp. 1392-1403 ◽  
Author(s):  
Dong-Fang Wu ◽  
Zhen Liu ◽  
Peng Ren ◽  
Xiao-He Liu ◽  
Ning Wang ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Schiff Base ◽  
Magnetocaloric Effect ◽  
Magnetic Relaxation ◽  
Lanthanide Complexes ◽  
Near Infrared ◽  
Relaxation Behavior ◽  
New Family ◽  
Infrared Luminescence ◽  
Slow Magnetic Relaxation

Gd/Dy complexes based on 8-hydroxiquinoline derivatives display a magnetocaloric effect and slow magnetic relaxation behavior.

Non-traditional thermal behavior of Co(II) coordination networks showing slow magnetic relaxation

2021 ◽  
Author(s):  
Anna Switlicka ◽  
Barbara Machura ◽  
Alina Bieńko ◽  
Dariusz Bieńko ◽  
Cyril Rajnák ◽  
...  
Keyword(s):  
Thermal Behavior ◽  
Coordination Polymers ◽  
Spin System ◽  
Magnetic Relaxation ◽  
Magnetic Data ◽  
Zero Field ◽  
Two Dimensional ◽  
Coordination Networks ◽  
One Dimensional ◽  
Slow Magnetic Relaxation

Three new coordination polymers, one-dimensional ones [Co(5,6-(Me)2–bzim)2(dca)2] (1), [Co(5-Mebzim)2(dca)2]n (2) and two-dimensional polymer [Co(2-Mebzim)(dca)2]n (3), show DC magnetic data consistent with the S = 3/2 spin system with large zero-field...

scholarly journals A family of multi-spin rare-earth complexes based on a triazole nitronyl nitroxide radical: synthesis, structure and magnetic properties

RSC Advances ◽  
2018 ◽  
Vol 8 (28) ◽  
pp. 15480-15486 ◽  
Author(s):  
Peng Yun Chen ◽  
Ming Ze Wu ◽  
Xiu Juan Shi ◽  
Li Tian
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Magnetic Relaxation ◽  
Nitroxide Radical ◽  
Rare Earth Complexes ◽  
Nitronyl Nitroxide ◽  
Nitronyl Nitroxide Radical ◽  
Frequency Dependent ◽  
Magnetic Susceptibilities ◽  
Slow Magnetic Relaxation

Three LnIII–triazole–radical complexes have been synthesized, which exhibit interesting magnetic properties. The TbIII complex shows frequency-dependent ac magnetic susceptibilities, which suggests the presence of slow magnetic relaxation.

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.

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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