Solvent dependent reactivities of di-, tetra- and hexanuclear manganese complexes: syntheses, structures and magnetic properties

2015 ◽  
Vol 44 (14) ◽  
pp. 6620-6629 ◽  
Author(s):  
Hua Yang ◽  
Fan Cao ◽  
Dacheng Li ◽  
Suyuan Zeng ◽  
You Song ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Solvent Effect ◽  
Ground State ◽  
Magnetic Relaxation ◽  
Manganese Complexes ◽  
Magnetic Analysis ◽  
Slow Magnetic Relaxation

An unusual solvent effect on the syntheses of di-, tetra-, and hexanuclear manganese complexes has been exhibited. Complex 5 displayed the first stacked, off-set 8-azametallacrown-3. Magnetic analysis showed slow magnetic relaxation with S = 4 ground state.

scholarly journals X-ray Structure and Magnetic Properties of Heterobimetallic Chains Based on the Use of an Octacyanidodicobalt(III) Complex as Metalloligand

2020 ◽  
Vol 6 (4) ◽  
pp. 66
Author(s):  
Maria-Gabriela Alexandru ◽  
Diana Visinescu ◽  
Sergiu Shova ◽  
Abdeslem Bentama ◽  
Francesc Lloret ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Ground State ◽  
Magnetic Relaxation ◽  
Magnetic Measurements ◽  
Theoretical Calculations ◽  
X Ray ◽  
Slow Magnetic Relaxation ◽  
D Values ◽  
Transversal Magnetic ◽  
Strong Asymmetry

The assembly of [Co2III(μ-2,5-dpp)(CN)8]2− anions and [MII(CH3OH)2(DMSO)2]2+ cations resulted into the formation of two heterobimetallic 1D coordination polymers of formula [MII(CH3OH)2(DMSO)2(μ-NC)2Co2III(μ-2,5-dpp)(CN)6]n·4nCH3OH [M = CoII (1)/FeII (2) and 2,5-dpp = 2,5-bis(2-pyridyl)pyrazine. The [Co2III(μ-2,5-dpp)(CN)8]2− metalloligand coordinates the paramagnetic [MII(CH3OH)2(DMSO)2]2+ complex cations, in a bis-monodentate fashion, to give rise to neutral heterobimetallic chains. Cryomagnetic dc (1.9–300 K) and ac (2.0–13 K) magnetic measurements for 1 and 2 show the presence of Co(II)HS (1) and Fe(II)HS (2) ions (HS – high-spin), respectively, with D values of +53.7(5) (1) and −5.1(3) cm−1 (2) and slow magnetic relaxation for 1, this compound being a new example of SIM with transversal magnetic anisotropy. Low-temperature Q-band EPR study of 1 confirms that D value is positive, which reveals the occurrence of a strong asymmetry in the g-tensors and allows a rough estimation of the E/D ratio, whereas 2 is EPR silent. Theoretical calculations by CASSCF/NEVPT2 on 1 and 2 support the results from magnetometry and EPR. The analysis of the ac magnetic measurements of 1 shows that the relaxation of M takes place in the ground state under external magnetic dc fields through dominant Raman and direct spin-phonon processes.

scholarly journals Ferrotoroidic ground state in a heterometallic {CrIIIDyIII 6} complex displaying slow magnetic relaxation

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Kuduva R. Vignesh ◽  
Alessandro Soncini ◽  
Stuart K. Langley ◽  
Wolfgang Wernsdorfer ◽  
Keith S. Murray ◽  
...  
Keyword(s):  
Ground State ◽  
Magnetic Relaxation ◽  
Slow Magnetic Relaxation

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.

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.

3D isomorphous lanthanide coordination polymers displaying magnetic refrigeration, slow magnetic relaxation and tunable proton conduction

2018 ◽  
Vol 47 (43) ◽  
pp. 15405-15415 ◽  
Author(s):  
Siba Prasad Bera ◽  
Arpan Mondal ◽  
Subhadip Roy ◽  
Bijoy Dey ◽  
Atanu Santra ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Coordination Polymers ◽  
Magnetic Relaxation ◽  
Magnetic Refrigeration ◽  
Proton Conduction ◽  
Lanthanide Coordination Polymers ◽  
Slow Magnetic Relaxation ◽  
Coordination Frameworks

Four lanthanide 3D coordination frameworks with 1D hydrophilic channels along the crystallographic c direction have been investigated for their proton conduction and magnetic properties.

scholarly journals Neodymium β-diketonate showing slow magnetic relaxation and acting as a ratiometric thermometer based on near-infrared emission

RSC Advances ◽  
2019 ◽  
Vol 9 (41) ◽  
pp. 23444-23449 ◽  
Author(s):  
Kunal Kumar ◽  
Daisuke Abe ◽  
Keiko Komori-Orisaku ◽  
Olaf Stefańczyk ◽  
Koji Nakabayashi ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Single Molecule ◽  
Magnetic Relaxation ◽  
Near Infrared ◽  
Infrared Emission ◽  
Thermally Induced ◽  
Slow Magnetic Relaxation ◽  
Near Infrared Emission

In this work, we investigated thermally-induced Nd-based one centred ratiometric thermometer which also exhibit single molecule magnetic properties.

A substituent effect of phenylacetic acid coligand perturbed structures and magnetic properties observed in two triple-bridged azido-Cu(ii) chain compounds with ferromagnetic ordering and slow magnetic relaxation

2017 ◽  
Vol 46 (23) ◽  
pp. 7556-7566 ◽  
Author(s):  
Xiangyu Liu ◽  
Xiaohui Ma ◽  
Peipei Cen ◽  
Yuewei Wu ◽  
Chengcheng Zhang ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Substituent Effect ◽  
Magnetic Relaxation ◽  
Phenylacetic Acid ◽  
Slow Magnetic Relaxation ◽  
Chain Compounds ◽  
Ferromagnetic Ordering

Two triple-bridged azido-Cu(ii) chains exhibit distinct magnetic behaviors.

scholarly journals Pentanuclear [2.2] spirocyclic lanthanide(iii) complexes: slow magnetic relaxation of the DyIII analogue

2015 ◽  
Vol 44 (44) ◽  
pp. 19282-19293 ◽  
Author(s):  
Sourav Biswas ◽  
Sourav Das ◽  
Jan van Leusen ◽  
Paul Kögerler ◽  
Vadapalli Chandrasekhar
Keyword(s):  
Magnetic Relaxation ◽  
Slow Relaxation ◽  
Magnetic Analysis ◽  
Slow Magnetic Relaxation

A series of [2.2] spirocyclic complexes [Ln5(LH)4(η1-Piv)(η2-Piv)3(μ2–η2 η1Piv)2(H2O)]·Cl (Ln = DyIII, TbIII and HoIII) were synthesized. Magnetic analysis reveals that the DyIII analogue showed slow relaxation of magnetization.

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