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.

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.

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.

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.

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.

Heterotrimetallic {LnOVPt} complexes with antiferromagnetic Ln–V coupling and magnetic memory

2020 ◽  
Vol 56 (75) ◽  
pp. 11062-11065
Author(s):  
Stephanie A. Beach ◽  
Jesse L. Guillet ◽  
Sydney P. Lagueux ◽  
Mauro Perfetti ◽  
Brooke N. Livesay ◽  
...  
Keyword(s):  
Magnetic Relaxation ◽  
Antiferromagnetic Coupling ◽  
Magnetic Memory ◽  
Slow Magnetic Relaxation

PtVO(SOCR)4 lantern complexes and Ce(OAr)3 or Nd(OAr)3 form heterotrimetallic [Ln(OAr)3{PtVO(SOCR)4}] with linear Ln–OVPt linkages; all four exhibit slow magnetic relaxation and likely antiferromagnetic coupling.

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.

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