Slow magnetic relaxation in CoII–LnIII heterodinuclear complexes achieved through a functionalized nitronyl nitroxide biradical

2020 ◽  
Vol 49 (4) ◽  
pp. 1089-1096 ◽  
Author(s):  
Lu Xi ◽  
Juan Sun ◽  
Kang Wang ◽  
Jiao Lu ◽  
Pei Jing ◽  
...  
Keyword(s):  
Magnetic Relaxation ◽  
Nitronyl Nitroxide ◽  
Frequency Dependent ◽  
Slow Magnetic Relaxation

Five nitronyl nitroxide biradical-CoII–LnIII heterodinuclear complexes were achieved and the DyCo derivative displayed visible temperature/frequency-dependent χ′′ peaks, indicating the SMM behavior.

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.

Slow relaxation of magnetization in unprecedented Cu–Ln-Rad hetero-tri-spin chains constructed from multidentate nitronyl nitroxide

2019 ◽  
Vol 7 (29) ◽  
pp. 9057-9064 ◽  
Author(s):  
Juan Sun ◽  
Zan Sun ◽  
Kang Wang ◽  
Lu Xi ◽  
Yue Ma ◽  
...  
Keyword(s):  
Magnetic Relaxation ◽  
Spin Chains ◽  
Slow Relaxation ◽  
Nitronyl Nitroxide ◽  
Nitronyl Nitroxides ◽  
Slow Magnetic Relaxation

Unprecedented Cu–Ln heterometallic chains derived from poly-dentate nitronyl nitroxides are reported. A Tb complex shows slow magnetic relaxation, while a Dy derivative displays interesting two-step relaxations of magnetization.

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.

Two Lanthanide–nitronyl nitroxide radicals compounds with slow magnetic relaxation behavior

2015 ◽  
Vol 1081 ◽  
pp. 348-354 ◽  
Author(s):  
Chen-Xi Zhang ◽  
Xue-Mei Qiao ◽  
Yu-Kun Kong ◽  
Bingwu Wang ◽  
Yu-Ying Zhang ◽  
...  
Keyword(s):  
Magnetic Relaxation ◽  
Relaxation Behavior ◽  
Nitronyl Nitroxide ◽  
Nitroxide Radicals ◽  
Slow Magnetic Relaxation

Slow magnetic relaxation in two-dimensional 3d–4f complexes based on phenyl pyrimidyl substituted nitronyl nitroxide radicals

2015 ◽  
Vol 44 (21) ◽  
pp. 9815-9822 ◽  
Author(s):  
Mei Zhu ◽  
Juanjuan Wang ◽  
Meng Yang ◽  
Yue Ma ◽  
Licun Li
Keyword(s):  
Magnetic Relaxation ◽  
Relaxation Behavior ◽  
Two Dimensional ◽  
Nitronyl Nitroxide ◽  
Nitroxide Radicals ◽  
Slow Magnetic Relaxation

Three isostructural two-dimensional nitronyl nitroxide bridged 3d–4f complexes have been achieved. The Tb complex shows field-induced two-step magnetic relaxation behavior.

Slow magnetic relaxation and antiferromagnetic ordering in a one dimensional nitronyl nitroxide–Tb(iii) chain

2012 ◽  
Vol 36 (10) ◽  
pp. 2088 ◽  
Author(s):  
Ruina Liu ◽  
Congming Zhang ◽  
Xuelan Mei ◽  
Peng Hu ◽  
Haixia Tian ◽  
...  
Keyword(s):  
Magnetic Relaxation ◽  
Nitronyl Nitroxide ◽  
One Dimensional ◽  
Antiferromagnetic Ordering ◽  
Slow Magnetic Relaxation

Slow magnetic relaxation and field-induced metamagnetism in nitronyl nitroxide-Dy(iii) magnetic chains

2015 ◽  
Vol 44 (10) ◽  
pp. 4560-4567 ◽  
Author(s):  
Xiufeng Wang ◽  
Yungai Li ◽  
Peng Hu ◽  
Juanjuan Wang ◽  
Licun Li
Keyword(s):  
Magnetic Relaxation ◽  
Nitronyl Nitroxide ◽  
One Dimensional ◽  
Slow Magnetic Relaxation ◽  
Magnetic Chains

Four new one-dimensional Ln-nitronyl nitroxide complexes have been obtained. The Dy chain exhibits slow magnetic relaxation and three-step metamagnetism.

Nitronyl nitroxide based 2p–3d–4f chains with the magnetocaloric effect and slow magnetic relaxation

2015 ◽  
Vol 44 (42) ◽  
pp. 18411-18417 ◽  
Author(s):  
Xiufeng Wang ◽  
Cun Li ◽  
Juan Sun ◽  
Licun Li
Keyword(s):  
Magnetocaloric Effect ◽  
Magnetic Relaxation ◽  
Nitronyl Nitroxide ◽  
Slow Magnetic Relaxation

Rare nitronyl nitroxide based 2p–3d–4f chains are achieved. The Gd derivative shows the magnetocaloric effect and the Tb complex exhibits slow magnetic relaxation.

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.

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