A5041174368- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Advanced Condensed Matter Physics
- Crystallography and molecular interactions
- Metal complexes synthesis and properties
- Metal-Organic Frameworks: Synthesis and Applications
- Physics of Superconductivity and Magnetism
- Electron Spin Resonance Studies
- Polyoxometalates: Synthesis and Applications
- Magnetic properties of thin films
- Organic and Molecular Conductors Research
- Magnetic Properties of Alloys
- Organometallic Complex Synthesis and Catalysis
- Iron oxide chemistry and applications
- Analytical Chemistry and Sensors
- Advanced biosensing and bioanalysis techniques
- Radioactive element chemistry and processing
- Metalloenzymes and iron-sulfur proteins
- Multiferroics and related materials
- Geological and Geophysical Studies
- CO2 Reduction Techniques and Catalysts
- Theoretical and Computational Physics
- Quantum many-body systems
University of Almería
2021-2024
Tohoku University
2019-2024
Universidad de Granada
2011-2024
A N 6 -tripodal ligand allows the preparation of a family prismatic mononuclear cationic Co II complexes with SMM behavior. Their axial anisotropy, magnetic relaxation and hysteresis width are modulated by anion effects on crystal structure.
Herein we report a dinuclear [(μ-mbpymNO){(tmh)3Dy}2] (1) single-molecule magnet (SMM) showing two nonequivalent DyIII centers, which was rationally prepared from the reaction of Dy(tmh)3 moieties (tmh = 2,2,6,6-tetramethyl-3,5-heptanedionate) and asymmetric bis-bidentate bridging ligand 4-methylbipyrimidine (mbpymNO). Depending on whether ions coordinate to N^O or N^N bidentate donor sets, sites present NO7 ( D2 d geometry) N2O6 D4 d) coordination sphere. As consequence, different thermally...
Three new sets of mononuclear Ln(III) complexes general formulas [LnL3 ]⋅CH3 OH [Ln(III) =Yb (1), Er (2), Dy (3), Gd (4), and Eu (5)], [LnL2 (tmh)(CH3 OH)]⋅n H2 O⋅m CH3 (1 b), (2 (3 (4 b)], (tta)(CH3 OH)]⋅CH3 c), c)] were prepared by the reaction Ln(CF3 SO3 )⋅n O salts with tridentate ligand 2-(tetrazol-5-yl)-1,10-phenanthroline (HL) and, for last two sets, additionally β-diketonate ligands 2,2,6,6-tetramethylheptanoate (tmh) 2-thenoyltrifluoroacetonate (tta), respectively. In ions are...
Abstract The dissolution of anhydrous iron bromide in a mixture pyridine and acetonitrile, the presence an organic amine, results formation [Fe 34 ] metal oxide molecule, structurally characterised by alternate layers tetrahedral octahedral Fe III ions connected hydroxide ions. outer shell complex is capped combination molecules Magnetic data, measured at temperatures as low 0.4 K fields up to 35 T, reveal competing antiferromagnetic exchange interactions; DFT calculations showing that...
The effects of the electronic structure and flexibility triflate anions in a new high-<italic>U</italic><sub>eff</sub>TBPY-7 SMM, [Dy(OPCy<sub>3</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>5</sub>](CF<sub>3</sub>SO<sub>3</sub>)<sub>3</sub>·2OPCy<sub>3</sub>, have been analyzed.
A new linear trinuclear Co(II)3 complex with a formula of [{Co(μ-L)}2Co] has been prepared by self-assembly Co(II) ions and the N3O3-tripodal Schiff base ligand H3L, which is obtained from condensation 1,1,1-tris(aminomethyl)ethane salicylaldehyde. Single X-ray diffraction shows that this compound centrosymmetric triple-phenolate bridging groups connecting neighboring ions, leading to paddle-wheel-like structure pseudo-C3 axis lying in Co–Co–Co direction. The at both ends molecule exhibit...
Chiral bipyrimidine-bridged dinuclear LnIII complexes of general formula [(μ-bipym){((+)-tfacam)3Ln}2] and [(μ-bipym){((-)-tfacam)3Ln}2], have been prepared from the assembly Ln(AcO)3·nH2O (LnIII = Dy, Gd), (+)/(-)-3-(trifluoroacetyl)camphor enantiopure ligands ((+)/(-)-Htfacam) bipyrimidine (bipym). The structure chirality these supported by single-crystal X-Ray diffraction circular dichroism. study magnetic properties GdIII revealed a very weak antiferromagnetic interaction between ions...
The replacement of pyridine by 1-methyl-imidazol in the arms a N6-tripodal ligand allows preparing two new CoII complexes with quasi-ideal triangular prismatic geometry, which behave as SIMs (Single Ion Magnets) at zero dc field enhanced axial magnetic anisotropy, relaxation times and hysteresis.
A series of trinuclear Ln3 complexes (LnIII = Yb (1), Er (2), Dy (3) and Gd (4)) were prepared from the tris-chelate bidentate ligand 1,4,5,8,9,12-hexaazatriphenylene (HAT). 1 2 exhibited field-induced single-molecule-magnet (SMM) behavior with estimated Ueff values 21.30 13.86 K, respectively. Complex 3 behaved as a SMM even at zero field, two different thermally assisted relaxation processes detected 29.6 K (fast process, FR) 69 (slow SR) due to existence magnetically DyIII centers in...
Au<sup>I</sup>atoms play an important role in determining the anisotropy of Co<sup>II</sup>nodes 2D Au<sup>I</sup>–Co<sup>II</sup>field-induced SIMs.
We present a comprehensive study of the magnetic properties strongly anisotropic ferrimagnet ${\mathrm{ErFe}}_{5}{\mathrm{Al}}_{7}$ in pulsed fields up to 30 T applied along hard magnetization axis within basal plane tetragonal lattice around compensation temperature (${T}_{\mathrm{comp}}$). Macroscopic measurements showed two anomalies at about 8 and 25 small range ${T}_{\mathrm{comp}}$. High-field x-ray circular dichroism (XMCD) data Er ${M}_{5}$- Fe ${L}_{3}$-edge resonances provide...
Bare (1) and silica coated (1@SiO2) spin crossover (SCO) nanoparticles based on the polymer {[Fe(NH2Trz)3](BF4)2}n have been prepared following a water-in-oil synthetic procedure. For 1, critical temperatures of transition are TC↓ = 214.6 K TC↑ 220.9 K. 1@SiO2, abruptness is enhanced centred at room temperature (TC↓ 292.1 296.3 K). An inert Re(I) complex formula [Re(phen)(CO)3(PETES)](PF6) (phen 10-phenanthroline; PETES 2(4-pyridylethyl)triethoxysilane) (Re) was also synthesized yielding...
Introducing a dicarboxylate linker in linear tetranuclear bis(ZnDy) complex enables the serendipitous formation of cyclic version system with U eff = 342 K.
We report the direct observation of a commensurate-ordered antiferromagnetic (AFM) state but incommensurate helical spin dynamics in natural mineral brochantite ${\mathrm{Cu}}_{4}{\mathrm{SO}}_{4}{(\mathrm{OH})}_{6}$ through neutron diffraction and spectroscopy measurements. Inelastic scattering measurements reveal magnonlike excitations with considerable dispersion along $c$ axis almost flat branches other principal directions, indicating strong one-dimensional character magnetic...
Aniline derivatives such as luminol and benzidines can be electropolymerized for the preparation of electrochemiluminescent sensors.
The low-temperature magnetic properties and structure of fully dehydrated black dioptase ${\mathrm{Cu}}_{6}{\mathrm{Si}}_{6}{\mathrm{O}}_{18}$ have been studied by single-crystal neutron diffraction magnetization measurements in fields up to 30 T. intrachain ${J}_{c}$ interchain ${J}_{ab}$ interactions as well the anisotropy exchange coupling determined using inelastic neutron-scattering techniques. Zero-field antiferromagnetic order at ${T}_{\mathrm{N}}=6.7$ K can be described a...
Abstract The dissolution of anhydrous iron bromide in a mixture pyridine and acetonitrile, the presence an organic amine, results formation [Fe 34 ] metal oxide molecule, structurally characterised by alternate layers tetrahedral octahedral Fe III ions connected hydroxide ions. outer shell complex is capped combination molecules Magnetic data, measured at temperatures as low 0.4 K fields up to 35 T, reveal competing antiferromagnetic exchange interactions; DFT calculations showing that...
We report the direct observation of a commensurate-ordered antiferromagnetic (AFM) state but incommensurate helical spin dynamics in natural mineral brochantite Cu$_4$SO$_4$(OH)$_6$ through neutron diffraction and spectroscopy measurements. Inelastic scattering measurements reveal magnon-like excitations with considerable dispersion along c-axis almost flat branches other principal directions, indicating strong one-dimensional character magnetic correlations. experimentally observe effect...
We report here the synthesis of a series nine coordinated mononuclear LnIII complexes [LnL1Cl2(DMF)]Cl·2.5DMF and [LnL1(L2)2]Cl·4CH3OH (LnIII = GdIII, DyIII, ErIII YbIII, HL2 9-anthracenecarboxylic acid), where L1 is hexadentate N4O2 Schiff base ligand prepared from condensation 1,10-phenanthroline-2,9-dicarbaldehyde semicarbazone. The X-ray crystal structures these show ions to possess LnN4O2Cl2 LnN4O4 coordination spheres, which can be considered derived hexagonal bipyramidal geometry,...
The high-field magnetic properties and order of the gem mineral green dioptase ${\mathrm{Cu}}_{6}[{\mathrm{Si}}_{6}{\mathrm{O}}_{18}]\ifmmode\cdot\else\textperiodcentered\fi{}6{\mathrm{H}}_{2}\mathrm{O}$ have been studied by means single-crystal neutron diffraction in fields up to 21 T magnetization measurements 30 T. In zero field, ${\mathrm{Cu}}^{2+}$ moments antiferromagnetic chains are oriented along $c$ axis with a small off-axis tilt. For field applied parallel axis, shows...
We performed soft x-ray spectroscopic studies of the ferrimagnet ${\mathrm{TbFe}}_{5}{\mathrm{Al}}_{7}$ with strong easy-plane anisotropy in pulsed magnetic fields up to 29 T along bulk magnetization and magnetostriction measurements. observed pronounced amplitude changes circular dichroism absorption spectra at field-induced transition. This microscopically evidences simultaneous rotation Tb $4f$ Fe $3d$ moments from a collinear ferrimagnetic order [100] axis state close [010], other...