Control of nuclearity in heterometallic CuII–MnIIcomplexes derived from asymmetric Schiff bases: structures and magnetic properties

2018 ◽  
Vol 47 (10) ◽  
pp. 3568-3579 ◽  
Author(s):  
Prithwish Mahapatra ◽  
Sanjib Giri ◽  
Michael G. B. Drew ◽  
Ashutosh Ghosh
Keyword(s):  
Magnetic Properties ◽  
Schiff Bases ◽  
Magnetic Measurements ◽  
Dft Study ◽  
Trinuclear Complex ◽  
Donor Ligands ◽  
Dinuclear Complexes ◽  
The One

Among three asymmetric Schiff bases used for the synthesis of heterometallic CuII–MnIIcomplexes, the one with N2O2donor atoms yielded a tetranuclear and a trinuclear complex whereas two N2O3donor ligands produced solely dinuclear complexes. The results of magnetic measurements have been justified by DFT study.

Intermolecular interaction energies and magnetic properties of spin-isolated multinuclear CuII complexes

2020 ◽  
Vol 76 (2) ◽  
pp. 166-176
Author(s):  
Juan F. Torres ◽  
Nestor J. Bello-Vieda ◽  
Mario A. Macías ◽  
Renato Rabelo ◽  
Francisco Lloret ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Intermolecular Interaction ◽  
Trinuclear Complex ◽  
Dinuclear Complexes ◽  
Dispersion Forces ◽  
Interaction Energies ◽  
Framework Analysis ◽  
Magnetic Exchange ◽  
Exchange Constants

Dinuclear CuII complexes with 3,5-dinitrobenzoates and 2,2′-bipyridine (2) or 1,10-phenanthroline (3) were synthesized and characterized. A complete energy framework analysis using the HF/3-21G energy model was performed which found that dispersion forces and C—H...O interactions are responsible for the crystal structure features. The magnetic properties of the complexes show a weak magnetic exchange between spins, resulting in low exchange constants of −2.72 (1) cm−1 and −1.10 (1) cm−1 for complexes (2) and (3), respectively. This results from the low overlap between magnetic orbitals induced by 3,5-dinitrobenzoate bridges and the arrangement of the magnetic orbitals. Consequently, the dinuclear complexes (2) and (3) behave as spin-isolated multinuclear CuII species in contrast to the trinuclear complex with similar ligands.

Photoluminescence and Magnetic Properties of Undoped and (Mn, Co) co-doped ZnO Nanoparticles

2020 ◽  
Vol 16 (4) ◽  
pp. 655-666
Author(s):  
Mona Rekaby
Keyword(s):  
Magnetic Properties ◽  
Zno Nanoparticles ◽  
Room Temperature ◽  
Magnetic Measurements ◽  
Structural Defects ◽  
Ferromagnetic Behavior ◽  
Secondary Phases ◽  
Antiferromagnetic Ordering ◽  
Doped Zno ◽  
Co Doped

Objective: The influence of Manganese (Mn2+) and Cobalt (Co2+) ions doping on the optical and magnetic properties of ZnO nanoparticles was studied. Methods: Nanoparticle samples of type ZnO, Zn0.97Mn0.03O, Zn0.96Mn0.03Co0.01O, Zn0.95Mn0.03 Co0.02O, Zn0.93Mn0.03Co0.04O, and Zn0.91Mn0.03Co0.06O were synthesized using the wet chemical coprecipitation method. Results: X-ray powder diffraction (XRD) patterns revealed that the prepared samples exhibited a single phase of hexagonal wurtzite structure without any existence of secondary phases. Transmission electron microscope (TEM) images clarified that Co doping at high concentrations has the ability to alter the morphologies of the samples from spherical shaped nanoparticles (NPS) to nanorods (NRs) shaped particles. The different vibrational modes of the prepared samples were analyzed through Fourier transform infrared (FTIR) measurements. The optical characteristics and structural defects of the samples were studied through Photoluminescence (PL) spectroscopy. PL results clarified that Mn2+ and Co2+ doping quenched the recombination of electron-hole pairs and enhanced the number of point defects relative to the undoped ZnO sample. Magnetic measurements were carried out at room temperature using a vibrating sample magnetometer (VSM). (Mn, Co) co-doped ZnO samples exhibited a ferromagnetic behavior coupled with paramagnetic and weak diamagnetic contributions. Conclusion: Mn2+ and Co2+ doping enhanced the room temperature Ferromagnetic (RTFM) behavior of ZnO. In addition, the signature for antiferromagnetic ordering between the Co ions was revealed. Moreover, a strong correlation between the magnetic and optical behavior of the (Mn, Co) co-doped ZnO was analyzed.

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

Inorganics ◽  
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.

Synthesis, structure, magnetic properties and DFT study of a dinuclear copper(II) macrocyclic complex containing acetate groups

2021 ◽  
Vol 520 ◽  
pp. 120310
Author(s):  
Marjan Abedi ◽  
Ray J. Butcher ◽  
Amir Nasser Shamkhali ◽  
Vojislav Spasojevic ◽  
Karrar Al-Ameed ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Macrocyclic Complex ◽  
Dft Study ◽  
Dinuclear Copper

scholarly journals Electronic and magnetic properties of the [Ni(salophen)]: An experimental and DFT study

2018 ◽  
Vol 9 ◽  
pp. 27-33 ◽  
Author(s):  
Rodrigo A. Mendes ◽  
José Carlos Germino ◽  
Bruno R. Fazolo ◽  
Ericson H.N.S. Thaines ◽  
Franklin Ferraro ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Dft Study ◽  
Electronic And Magnetic Properties

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

2007 ◽  
Vol 130 ◽  
pp. 171-174 ◽  
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.

Synthesis, structure and magnetic properties of pyrazolate-bridged dinuclear complexes [{M(NCS)(4-Phpy)}2(μ-bpypz)2] (M=Co2+ and Fe2+)

Polyhedron ◽  
2005 ◽  
Vol 24 (16-17) ◽  
pp. 2437-2442 ◽  
Author(s):  
Ko Yoneda ◽  
Keisaku Nakano ◽  
Junji Fujioka ◽  
Koichi Yamada ◽  
Takayoshi Suzuki ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Dinuclear Complexes
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