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

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.

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Syntheses, Structures, and Magnetic Properties of a Series of Heterotri-, Tetra- and Pentanuclear LnIII–CoII Compounds

Polymers ◽

10.3390/polym11020196 ◽

2019 ◽

Vol 11 (2) ◽

pp. 196 ◽

Cited By ~ 2

Author(s):

Yun Xu ◽

Luo Feng ◽

Ji-Min Zheng

Keyword(s):

Magnetic Properties ◽

Ir Spectroscopy ◽

Single Crystal ◽

Magnetic Relaxation ◽

Magnetic Measurements ◽

Relaxation Behavior ◽

Structural Motif ◽

X Ray Diffraction ◽

Hydrothermal Conditions ◽

X Ray

Three types of Ln(III)–Co(II) heterometallic compounds, LnCo2(L1)7(bipy)2 (Ln = Pr-1, Eu-2, Sm-3, Gd-4, Tb-5, Dy-6) (L1 = 4-chlorobenzoate, bipy = 2,2′-bipyridine), Ln2Co2(L2)10(bipy)2 (Ln = Sm-7, Gd-8, Tb-9, Dy-10, Ho-11, Er-12, Yb-13), (L2 = 2,4-dichlorobenzoate, bipy = 2,2′-bipyridine, phen = 1,10-phenanthroline), and Ln2Co3(L1)12(bipy)2 (Ln = Ho-14, Er-15, Yb-16), were synthesized under hydrothermal conditions and characterized by single crystal X-ray diffraction, IR spectroscopy and magnetic measurements. Structural analyses revealed that 14–16 take on a unique linear pentanuclear structural motif. Interestingly, the Ho-containing compound 14 exhibits magnetic relaxation behavior.

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

Dalton Transactions ◽

10.1039/c4dt03822c ◽

2015 ◽

Vol 44 (14) ◽

pp. 6620-6629 ◽

Cited By ~ 17

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.

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Field-induced slow magnetic relaxation in pseudooctahedral cobalt(ii) complexes with positive axial and large rhombic anisotropy

Dalton Transactions ◽

10.1039/c8dt03965h ◽

2019 ◽

Vol 48 (4) ◽

pp. 1404-1417 ◽

Cited By ~ 18

Author(s):

Anna Świtlicka ◽

Joanna Palion-Gazda ◽

Barbara Machura ◽

Joan Cano ◽

Francesc Lloret ◽

...

Keyword(s):

Crystal Structure ◽

Magnetic Properties ◽

Magnetic Relaxation ◽

Variable Temperature ◽

X Ray ◽

Slow Magnetic Relaxation

The preparation, X-ray crystal structure, spectroscopic and variable-temperature dc and ac magnetic properties of two six-coordinate cobalt(ii) complexes of formula [Co(bim)4(tcm)2] (1) and [Co(bmim)4(tcm)2] (2) are reported.

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Unprecedented family of heterometallic LnIII[18-metallacrown-6] complexes: syntheses, structures, and magnetic properties

Dalton Transactions ◽

10.1039/c7dt02735d ◽

2017 ◽

Vol 46 (38) ◽

pp. 13027-13034 ◽

Cited By ~ 7

Author(s):

Wei Yang ◽

Hua Yang ◽

Su-Yuan Zeng ◽

Da-Cheng Li ◽

Jian-Min Dou

Keyword(s):

Magnetic Properties ◽

Magnetic Relaxation ◽

Magnetic Measurements ◽

Molecular Formula ◽

Slow Magnetic Relaxation

A novel family LnIII[18-metallacrown-6] was synthesized with the molecular formula [Fe6O2Ln(tBu-sao)6(OH)(MeO)4(MeOH)(H2O)]·6MeOH (where, Ln = DyIII (1), TbIII (2), GdIII (3), and YIII (4)) using 3,5-di-tert-butylsalicylaldoxime (tBu-saoH2). Magnetic measurements indicate slow magnetic relaxation for complexes 1–3.

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A Dy(III) Fluorescent Single-Molecule Magnet Based on a Rhodamine 6G Ligand

Inorganics ◽

10.3390/inorganics9070051 ◽

2021 ◽

Vol 9 (7) ◽

pp. 51

Author(s):

Lin Miao ◽

Mei-Jiao Liu ◽

Man-Man Ding ◽

Yi-Quan Zhang ◽

Hui-Zhong Kou

Keyword(s):

Magnetic Properties ◽

Single Molecule ◽

Magnetic Relaxation ◽

Rhodamine 6G ◽

Bond Angle ◽

Magnetic Measurements ◽

Single Molecule Magnet ◽

Lanthanide Metals ◽

Process Studies ◽

Dual Functions

The complexes of lanthanide metals, especially dysprosium, can generally exhibit excellent magnetic properties. By means of modifying ligands, dual functions or even multi-functions can be achieved. Here, we synthesized an eight-coordinate Dy(III) complex 1, [Dy(HL-o)2(MeOH)2](ClO4)3·4.5MeOH, which is single-molecule magnet (SMM), and the introduction of the rhodamine 6G chromophore in the ring-opened ligand HL-o realizes ligand-centered fluorescence in addition to SMM. Magnetic measurements and ab initio calculations indicate that the magnetic relaxation for complex 1 should be due to the Raman relaxation process. Studies on magneto-structural correlationship of the rhodamine salicylaldehyde hydrazone Dy(III) complexes show that the calculated energy of the first Kramers Doublet (EKD1) is basically related to the Ophenoxy-Dy-Ophenoxy bond angle, i.e., the larger Ophenoxy-Dy-Ophenoxy bond angle corresponds to a larger EKD1.

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Two types of Ln2Cu2 hydroxo-trimethylacetate complexes with 0D and 1D motifs: synthetic features, structural differences, and slow magnetic relaxation

Dalton Transactions ◽

10.1039/d1dt01161h ◽

2021 ◽

Author(s):

Anna Bovkunova ◽

Evgeniya S. Bazhina ◽

Igor Evstifeev ◽

Yulia V. Nelyubina ◽

Maxim Shmelev ◽

...

Keyword(s):

Magnetic Relaxation ◽

X Ray Diffraction ◽

Metal Core ◽

X Ray ◽

Trimethylacetate Complexes ◽

Structural Differences ◽

Slow Magnetic Relaxation ◽

New Compounds

Two series of heterometallic LnIII−CuII compounds containing a butterfly-like tetranuclear metal core were synthesized and characterized by X-ray diffraction and magnetometry. The structures of the new compounds were shown to...

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Influence of Alloying Additions on Enhancement of Soft Magnetic Properties Effect and Crystallization in FeXSiB (X=Cu, V, Co, Zr, Nb) Amorphous Alloys

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.130.171 ◽

2007 ◽

Vol 130 ◽

pp. 171-174 ◽

Cited By ~ 3

Author(s):

Z. Stokłosa ◽

G. Badura ◽

P. Kwapuliński ◽

Józef Rasek ◽

G. Haneczok ◽

...

Keyword(s):

Magnetic Properties ◽

Amorphous Alloys ◽

Crystallization Process ◽

Annealing Temperature ◽

Magnetic Measurements ◽

X Ray Diffraction ◽

Soft Magnetic ◽

X Ray ◽

Second Stage ◽

Transmission Electron

The crystallization and optimization of magnetic properties effects in FeXSiB (X=Cu, V, Co, Zr, Nb) amorphous alloys were studied by applying X-ray diffraction methods, high resolution transmission electron microscopy (HRTEM), resistometric and magnetic measurements. The temperatures of the first and the second stage of crystallization, the 1h optimization annealing temperature and the Curie temperature were determined for different amorphous alloys. Activation energies of crystallization process were obtained by applying the Kissinger method. The influence of alloy additions on optimization effect and crystallization processes was carefully examined.

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

Nature Communications ◽

10.1038/s41467-017-01102-5 ◽

2017 ◽

Vol 8 (1) ◽

Cited By ~ 53

Author(s):

Kuduva R. Vignesh ◽

Alessandro Soncini ◽

Stuart K. Langley ◽

Wolfgang Wernsdorfer ◽

Keith S. Murray ◽

...

Keyword(s):

Ground State ◽

Magnetic Relaxation ◽

Slow Magnetic Relaxation

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Structures, fluorescence properties and magnetic properties of a series of rhombus-shaped LnIII4 clusters: magnetocaloric effect and single-molecule-magnet behavior

New Journal of Chemistry ◽

10.1039/c9nj02872b ◽

2019 ◽

Vol 43 (33) ◽

pp. 12941-12949 ◽

Cited By ~ 19

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.

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Nitronyl Nitroxide Biradical-Based Binuclear Lanthanide Complexes: Structure and Magnetic Properties

Magnetochemistry ◽

10.3390/magnetochemistry6040048 ◽

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.

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