scholarly journals Semiquinone radical-bridged M2 (M = Fe, Co, Ni) complexes with strong magnetic exchange giving rise to slow magnetic relaxation

2020 ◽  
Vol 11 (31) ◽  
pp. 8196-8203
Author(s):  
Khetpakorn Chakarawet ◽  
T. David Harris ◽  
Jeffrey R. Long
Keyword(s):  
Single Molecule ◽  
Magnetic Relaxation ◽  
Semiquinone Radical ◽  
Magnetic Exchange ◽  
Metal Centers ◽  
Single Molecule Magnet ◽  
Trigonal Bipyramidal ◽  
Slow Magnetic Relaxation

A semiquinone radical bridging two trigonal bipyramidal metal centers facilitates strong magnetic exchange and single-molecule magnet behavior.

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,...

Polyoxometalate-Supported Lanthanoid Single-Molecule Magnets

2014 ◽  
Vol 67 (11) ◽  
pp. 1542 ◽  
Author(s):  
Michele Vonci ◽  
Colette Boskovic
Keyword(s):  
Single Molecule ◽  
Energy Barrier ◽  
Magnetic Relaxation ◽  
Donor Ligands ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet ◽  
Coordination Numbers ◽  
Oxygen Donor ◽  
Slow Magnetic Relaxation

Polyoxometalates are robust and versatile multidentate oxygen-donor ligands, eminently suitable for coordination to trivalent lanthanoid ions. To date, 10 very different structural families of such complexes have been found to exhibit slow magnetic relaxation due to single-molecule magnet (SMM) behaviour associated with the lanthanoid ions. These families encompass complexes with between one and four of the later lanthanoid ions: Tb, Dy, Ho, Er, and Yb. The lanthanoid coordination numbers vary between six and eleven and a range of coordination geometries are evident. The highest energy barrier to magnetisation reversal measured to date for a lanthanoid–polyoxometalate SMM is Ueff/kB = 73 K for the heterodinuclear Dy–Eu compound (Bu4N)8H4[DyEu(OH)2(γ-SiW10O36)2].

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 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.

Zero-field slow magnetic relaxation in a uranium(iii) complex with a radical ligand

2014 ◽  
Vol 50 (71) ◽  
pp. 10262-10264 ◽  
Author(s):  
Joana T. Coutinho ◽  
Maria A. Antunes ◽  
Laura C. J. Pereira ◽  
Joaquim Marçalo ◽  
Manuel Almeida
Keyword(s):  
Single Molecule ◽  
Magnetic Relaxation ◽  
Zero Field ◽  
Single Molecule Magnet ◽  
Slow Magnetic Relaxation ◽  
Bipyridine Ligand ◽  
Radical Ligand

Single-molecule-magnet behaviour in [U(TpMe2)2(bipy˙)], a U(iii) complex with a radical bipyridine ligand, having magnetic contributions from both the metal and the ligand.

Modulation of slow magnetic relaxation by tuning magnetic exchange in {Cr2Dy2} single molecule magnets

2014 ◽  
Vol 5 (8) ◽  
pp. 3246-3256 ◽  
Author(s):  
Stuart K. Langley ◽  
Daniel P. Wielechowski ◽  
Veacheslav Vieru ◽  
Nicholas F. Chilton ◽  
Boujemaa Moubaraki ◽  
...  
Keyword(s):  
Exchange Interaction ◽  
Single Molecule ◽  
Magnetic Relaxation ◽  
Single Molecule Magnets ◽  
Magnetic Exchange Interaction ◽  
Magnetic Exchange ◽  
Slow Magnetic Relaxation

Newly synthesised {CrIII2DyIII2} single molecule magnets reveal that the size of the anisotropy barrier is related to the strength of the magnetic exchange interaction in the complex.

Single-Molecule Magnet Behavior of a Tetranuclear Iron(III) Complex. The Origin of Slow Magnetic Relaxation in Iron(III) Clusters

1999 ◽  
Vol 121 (22) ◽  
pp. 5302-5310 ◽  
Author(s):  
A. L. Barra ◽  
A. Caneschi ◽  
A. Cornia ◽  
F. Fabrizi de Biani ◽  
D. Gatteschi ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetic Relaxation ◽  
Single Molecule Magnet ◽  
Slow Magnetic Relaxation

Two field-induced slow magnetic relaxation processes in a mononuclear Co(ii) complex with a distorted octahedral geometry

2016 ◽  
Vol 45 (22) ◽  
pp. 9279-9284 ◽  
Author(s):  
Jing Li ◽  
Yuan Han ◽  
Fan Cao ◽  
Rong-Min Wei ◽  
Yi-Quan Zhang ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetic Relaxation ◽  
Easy Axis ◽  
Octahedral Geometry ◽  
Distorted Octahedral Geometry ◽  
Relaxation Processes ◽  
Single Molecule Magnet ◽  
Distorted Octahedral ◽  
Slow Magnetic Relaxation

An easy-axis distorted octahedral mononuclear Co(ii) single-molecule magnet showing two filed-induced slow magnetic relaxation processes.

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