Observation of Ferromagnetic Exchange, Spin Crossover, Reductively Induced Oxidation, and Field-Induced Slow Magnetic Relaxation in Monomeric Cobalt Nitroxides

2013 ◽  
Vol 52 (13) ◽  
pp. 7557-7572 ◽  
Author(s):  
Ian A. Gass ◽  
Subrata Tewary ◽  
Ayman Nafady ◽  
Nicholas. F. Chilton ◽  
Christopher J. Gartshore ◽  
...  
Keyword(s):  
Magnetic Relaxation ◽  
Spin Crossover ◽  
Ferromagnetic Exchange ◽  
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.

A mononuclear five-coordinate Co(ii) single molecule magnet with a spin crossover between the S = 1/2 and 3/2 states

2018 ◽  
Vol 47 (46) ◽  
pp. 16596-16602 ◽  
Author(s):  
Lei Chen ◽  
Jingbo Song ◽  
Wen Zhao ◽  
Gangji Yi ◽  
Zhikuan Zhou ◽  
...  
Keyword(s):  
Hysteresis Loop ◽  
Single Molecule ◽  
Magnetic Relaxation ◽  
Spin Crossover ◽  
Spin Transition ◽  
Single Molecule Magnet ◽  
Pyramidal Geometry ◽  
Mononuclear Cobalt ◽  
Slow Magnetic Relaxation ◽  
Square Pyramidal Geometry

A mononuclear cobalt(ii) complex with square pyramidal geometry displays a spin transition with a small hysteresis loop and slow magnetic relaxation.

Slow Magnetic Relaxation and Spin-Crossover Behavior in a Bicomponent Ion-Pair Cobalt(II) Complex

2017 ◽  
Vol 2017 (33) ◽  
pp. 3862-3867 ◽  
Author(s):  
Dong Shao ◽  
Lin-Dan Deng ◽  
Le Shi ◽  
Dong-Qing Wu ◽  
Xiao-Qin Wei ◽  
...  
Keyword(s):  
Magnetic Relaxation ◽  
Spin Crossover ◽  
Ion Pair ◽  
Crossover Behavior ◽  
Slow Magnetic Relaxation

Heterometallic {DyIII2FeII2} grids with slow magnetic relaxation and spin crossover

2021 ◽  
Author(s):  
Yu Zhang ◽  
Qianqian Yang ◽  
Jingjing Lu ◽  
Mei Guo ◽  
Xiao-Lei Li ◽  
...  
Keyword(s):  
Self Assembly ◽  
Magnetic Relaxation ◽  
Spin Crossover ◽  
The Self ◽  
Slow Magnetic Relaxation

The self-assembly of a DyIII ion, an FeII ion and a multitopic H2L ligand produces novel [2 × 2] {DyIII2FeII2} grids exhibiting slow magnetic relaxation and spin crossover.

Slow magnetic relaxation in five-coordinate spin-crossover cobalt(ii) complexes

2017 ◽  
Vol 53 (67) ◽  
pp. 9304-9307 ◽  
Author(s):  
Hui-Hui Cui ◽  
Jing Wang ◽  
Xue-Tai Chen ◽  
Zi-Ling Xue
Keyword(s):  
Spin State ◽  
Magnetic Relaxation ◽  
Spin Crossover ◽  
Slow Magnetic Relaxation

Slow magnetic relaxation originating from the low spin state Co(ii) ions is firstly observed in five-coordinate spin-crossover Co(ii) complexes.

Bulky anion supported a five-coordinate spin-crossover cobalt(II) complex with slow magnetic relaxation

2020 ◽  
Vol 289 ◽  
pp. 121535
Author(s):  
Hui−Hui Cui ◽  
Tong−Ming Sun ◽  
Miao Wang ◽  
Lei Chen ◽  
Yan−Feng Tang
Keyword(s):  
Magnetic Relaxation ◽  
Spin Crossover ◽  
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.

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,...

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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