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

Xu, Yun; Luo, Feng; Zheng, Ji‐Min

doi:10.3390/polym11020196

Cited by 8 publications

(6 citation statements)

References 44 publications

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“…The fitting of the experimental data to the Hamiltonian equation H = −2J(Ŝ Co1ŜGd + S Co2ŜGd )−2J'(Ŝ Co1ŜCo2 ) + DŜ z 2 + Σ i µg e f f → HŜ i , in the whole temperature range, provided the coupling values between Co II -Co II ions (J = +1.3 cm −1 ) and Co II -Gd III ions (J = +0.09 cm −1 ), respectively, with a mean g value of 2.35. This magnetic coupling is in agreement with previous studies in Co II -Gd III complexes, which always present a ferromagnetic coupling when the Co II is a high spin cation [49,50].…”

Section: Magnetism Studiessupporting

confidence: 93%

A Novel Family of Triangular CoII2LnIII and CoII2YIII Clusters by the Employment of Di-2-Pyridyl Ketone

et al. 2019

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The synthesis, structural characterization and magnetic study of novel Co II /4f and Co II /Y III clusters are described. In particular, the initial employment of di-2-pyridyl ketone, (py) 2 CO, in mixed metal Co/4f chemistry, provided access to four triangular clusters,is the monoanion of the hemiketal form of (py) 2 CO. Clusters 1-4 are the first reported Co/4f (1-3) and Co/Y (4) species bearing (py) 2 CO or its derivatives, despite the fact that over 200 metal clusters bearing this ligand have been reported so far. Variable-temperature, solid-state dc and ac magnetic susceptibility studies were carried out on 1-4 and revealed the presence of weak ferromagnetic exchange interactions between the metal ions (J Co-Co = +1.3 and +0.40 cm −1 in 1 and 4, respectively; J Co-Gd = +0.09 cm −1 in 1). The ac susceptibility studies on 2 revealed nonzero, weak out-of-phase (χ" M ) signals below~5 K.

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Section: Magnetism Studiessupporting

confidence: 93%

A Novel Family of Triangular CoII2LnIII and CoII2YIII Clusters by the Employment of Di-2-Pyridyl Ketone

et al. 2019

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“…The obtained results 1, 2 are consistent with the other empirical studies on 3d-4f complexes. According to research, the 3d-LnIII exchange interaction is usually ferromagnetic in the case of heavy lanthanides [34][35][36][37][38][46][47][48][49]. The results are also in a good agreement with Kahn et al's theoretical model, which suggested that for the light lanthanide ions(III) with a 4f 1 -4f 6 configuration, the angular and spin moments were antiparallel in the 2S+1 L J free-ion ground state (J = L − S).…”

Section: Magnetic Propertiessupporting

confidence: 63%

“…The 3d2Ln III 2 subunits are then bridged by azide ions [33]. According to the literature [34][35][36][37][38], significant efforts have been made in recent years to construct 3d-4f compounds to obtain novel single-molecule magnets (SMMs). Lanthanide ions, especially Tb III , Dy III , Ho III , and Er III , are widely used in the synthesis of 3d-4f SMMs due to their large In the reported 3d-Ln III complexes there are examples of hetero-di- [24][25][26][27], tri- [28][29][30], tetra- [27,31,32], and octanuclear [33] compounds (Figure 3).…”

Section: Introductionmentioning

confidence: 99%

The Crystal Structure and Physicochemical Properties of New Complexes Containing a CuII-LnIII-CuII Core

Cristóvão,

Osypiuk,

Mirosław

2024

Crystals

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Three new cationic complexes, [Cu4Tb2(H2L)4(NO3)4(H2O)3](NO3)2·5.5H2O·2MeOH (1), [Cu4Ho2(H2L)4(NO3)4(H2O)3](NO3)2·7.5H2O (2), and [Cu4Er2(H2 L)4(NO3)4(H2O)3](NO3)2·7H2O·3MeOH (3), were synthesized and studied using elemental and TG/DTG/DSC analyses, single-crystal X-ray diffraction, and magnetic measurements. The structure analysis showed that 1–3 crystallize as (NO3)-bridged compounds and that the lanthanide(III) ion acts as a joint connecting two [CuH2L] coordination units. In each heterotrinuclear unit, an asymmetry in the degree of planarity of the bridging CuO2Ln fragments is observed. The CuII ions are five- and six-coordinate, with distorted square pyramidal and octahedral geometry, respectively, whereas the LnIII ions are nine-coordinate. The solvates 1–3 are stable at room temperature, and their desolvation process is consistent with the loss of water and/or methanol molecules. The temperature dependence of the magnetic susceptibility and the field-dependent magnetization indicate the weak ferromagnetic interaction between the paramagnetic centers CuII and TbIII/HoIII 1 and 2.

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“…Some enzymes or catalysts in biological reactions are built from zinc complexes [6,7]. Transition metal-polycarboxylate complexes have fascinating magnetic, biological and structural characteristics [8][9][10][11]. The applications of the transition metal complexes of methylenebis(hydroxybenzoic acid) in catalysis, bioinorganic, electrochemistry, corrosion, metallic deactivators, environmental chemistry and separation methods are noteworthy [5,[12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Mammalian Cell Cytotoxicity, Antibacterial Activity and the Properties of Methylenebis(Hydroxybenzoic Acid) and Its Related Zinc(II) Complex

Ahmed,

Althobaiti,

Aljohani

et al. 2024

Crystals

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Formaldehyde, sulfuric acid and salicylic acid were combined to create a 3,3′-methylenebis(2-hydroxybenzoic acid) (MHB) ligand, which was subsequently permitted to bind with zinc(II) ions. The ligand and its zinc(II) complex (Zn–MHB) have been described by a combination of elemental analyses, spectral analyses (UV–Vis, IR, MS and NMR), XRD, TEM, as well as TGA measurement. The ligand has been suggested to coordinate to the zinc center in a tetradentate manner forming the binuclear tetrahedral complex. An X-ray analysis indicated a considerable difference between MHB (crystalline) and Zn–MHB (amorphous). The UV–Vis spectra were used to determine the optical properties such as bandgap, refractive index, optical conductivity and penetration depth. The possibility of employing the samples for optoelectronic applications was indicated from the band gap values which underlie the range of semiconductors. TEM revealed the spherical shapes and mutation of ligand particles into the nano-scale by complexation. The antimicrobial potential of the MHB towards Gram-positive and Gram-negative bacterial growths has been investigated. The results suggested that it would be possible to employ MHB to prevent bacterial development, particularly that of salmonella typhimurium. The cytotoxicity of the MHB was assessed against two types of mammalian cells: VERO (the kidney of an African green monkey) and HFB4 (human skin melanocytes). Lower sensitivity was observed in VERO cells.

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

Cited by 8 publications

References 44 publications

A Novel Family of Triangular CoII2LnIII and CoII2YIII Clusters by the Employment of Di-2-Pyridyl Ketone

A Novel Family of Triangular CoII2LnIII and CoII2YIII Clusters by the Employment of Di-2-Pyridyl Ketone

The Crystal Structure and Physicochemical Properties of New Complexes Containing a CuII-LnIII-CuII Core

Mammalian Cell Cytotoxicity, Antibacterial Activity and the Properties of Methylenebis(Hydroxybenzoic Acid) and Its Related Zinc(II) Complex

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