A5003548414- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Electron Spin Resonance Studies
- Advanced NMR Techniques and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Crystal Structures and Properties
- Luminescence Properties of Advanced Materials
- Polyoxometalates: Synthesis and Applications
- Organic and Molecular Conductors Research
- Metal-Catalyzed Oxygenation Mechanisms
- Porphyrin and Phthalocyanine Chemistry
- Metal complexes synthesis and properties
- Atomic and Subatomic Physics Research
- Diamond and Carbon-based Materials Research
- Spectroscopy and Quantum Chemical Studies
- Synthesis and Catalytic Reactions
- Molecular Junctions and Nanostructures
- Nuclear materials and radiation effects
- Advanced Condensed Matter Physics
- Inorganic Fluorides and Related Compounds
- Crystallography and molecular interactions
- Laser-Matter Interactions and Applications
- Oxidative Organic Chemistry Reactions
University of Stuttgart
2016-2021
Stuttgart Observatory
2017-2019
Center for Integrated Quantum Science and Technology
2019
Abstract The energy barrier leading to magnetic bistability in molecular clusters is determined by the anisotropy of cluster constituents. By incorporating a highly anisotropic four‐coordinate cobalt(II) building block into strongly coupled fully air‐ and moisture‐stable three‐spin system, it proved possible suppress under‐barrier Raman processes 350‐fold increase magnetization relaxation time pronounced hysteresis. Relaxation times up 9 hours at low temperatures were found.
An iridium(<sc>iii</sc>–<sc>v</sc>) imido series has been isolated that features an iridium complex with unprecedented triplet ground state.
We have investigated the electron spin dynamics in a series of copper(<sc>ii</sc>) β-diketonate complexes both frozen solutions and doped solids. simulate coherence decay quantitatively without fit parameters.
Abstract The rational design of the magnetic anisotropy molecular materials constitutes a goal primary importance in magnetism. Indeed, applications nanomagnets, such as single‐molecule magnets and refrigerants, depend on full control over this property. Axially anisotropic systems are frequently classified easy axis or plane, depending whether lowest energy is obtained by application field parallelly perpendicularly to unique axis. Here, three lanthanide complexes studied function...
Metal complexes of 1,2-diamidobenzenes have been long studied because their intriguing redox properties and electronic structures. We present here a series such with 1,2-bis(sulfonamido)benzene ligands to probe the utility these for generating large zero-field splitting (ZFS, D) in metal that possibly act as single-ion magnets. To this end, we synthesized homoleptic ate form (X)n[M{bis(sulfonamido)benzene}2] (n equals 4 minus oxidation state metal), where M (Fe/Co/Ni), X...
[Cr(ddpd)<sub>2</sub>]<sup>3+</sup>displays record phase memory times of up to 8.4 μs at 7 K. This is likely enabled by the very small zero-field splitting of<italic>D</italic>= 0.18 cm<sup>−1</sup>which due ligand field quartet state lying high energy.
Mechanically chelating ligands have untapped potential for the engineering of metal ion properties. Here we demonstrate this principle in context CoII -based single-ion magnets. Using multi-frequency EPR, susceptibility and magnetization measurements found that these complexes show some highest zero field splittings reported five-coordinate to date. The predictable coordination behaviour interlocked allowed magnetic properties their be evaluated computationally a priori our combined...
Early actinide ions have large spin-orbit couplings and crystal field interactions, leading to anisotropies. The success in using actinides as single-molecule magnets has so far been modest, underlining the need for rational strategies. Indeed, electronic structure of its relation their magnetic properties remains largely unexplored. A uranium(III) magnet, [UIII {SiMe2 NPh}3 -tacn)(OPPh3 )] (tacn=1,4,7-triazacyclononane), investigated by means a combination magnetic, spectroscopic...
Understanding magnetic anisotropy and specifically how to tailor it is crucial in the search for high-temperature single-ion magnets. Herein, we investigate a six-coordinated cobalt(II) compound that has complex geometry distinct triaxial from perspective of electronic structure, using spectra, ab initio calculations, an experimental charge density, which latter two provides insight into d-orbital splitting. The analysis showed splitting satisfactorily predicted exhibited by compound....
A series of unprecedented supramolecular associates phenylarsonate-capped {MII PdII12 O8 }-type (M=Co, Ni and Zn) polyoxopalladates with α-cyclodextrins (α-CD) was obtained characterized in the solid state (single-crystal X-ray diffraction (XRD), FT-IR spectroscopy, elemental thermogravimetric (TGA) analyses), aqueous solution (1 H 13 C NMR) gas phase (ESI-MS). The non-covalent host-guest interactions between organopolyoxoanions α-CD rings alter coordination environment a 3d transition metal...
We report a combined computational and experimental study of SMM properties two new pivalate cobalt complexes.
Multifrequency electron paramagnetic resonance (EPR) spectroscopy, magnetic susceptibility measurements, and density functional theory (DFT) have been employed to characterize the properties of Cu2+ ions their interactions in porous metal–organic framework compound ∞3[Cu(prz–trz–ia)]. Two distinct cupric ion species were found contribute overall polycrystalline material. The majority copper forms antiferromagnetically coupled pairs located at sites dinuclear metal units this coordination...
Lemon-yellow single crystals of Eu2[SiO4] were obtained by reaction elemental europium with Eu2O3 in the presence SiO2 carried out evacuated silica ampules at 1373 K for 48 h followed constant cooling to room temperature 120 per hour. crystallizes larnite-type structure β-Ca2[SiO4] (monoclinic, P21/n) parameters a = 565.02(5), b 709.15(6), c 975.84(8) pm, β 92.614(3)° Z 4. At 452 it undergoes reversible phase transition an incommensurate similar isotypic compounds Sr2[SiO4] and K2[SeO4]. The...
The method of choice for in-depth investigation the magnetic anisotropy in molecular nanomagnets is high-frequency electron spin resonance (HFESR) spectroscopy. It has benefits high resolution and facile access to large energy splittings. However, sensitivity limited about 107 spins a reasonable data acquisition time. In contrast, methods based on measurement deflection cantilever were shown enable single sensitivity. area nanomagnets, technique torque detected (TDESR) been used...
Abstract Die zur magnetischen Bistabilität führende Energiebarriere wird in molekularen Clustern durch die magnetische Anisotropie der einzelnen Komponenten des Clusters bestimmt. Verwendung eines anisotropen, vierfach koordinierten Cobalt(II)‐Bausteines ermöglichte Darstellung luft‐ und hydrolysestabilen, stark gekoppelten Drei‐Spin‐Systems. Dieses konnte den Raman‐Relaxationsprozess erheblich unterdrücken, wodurch Relaxation Magnetisierung gegenüber verwendeten Bausteins um ein 350‐faches...
Abstract A series of heterometallic [Ti IV 7 M III ] rings are reported which contain a single paramagnetic metal centre, either Fe or Cr . The structures an octagon metals bridged by oxides within the ring and pivalate ligands outside ring. encapsulate cation, secondary ammonium cation cesium. Multi-frequency EPR spectroscopy was used to measure zero-field splitting parameters for sites. sites have rhombic anisotropy, with D around − 0.18 cm −1 λ (= D/E ) approximately 0.25. more axial 0.5...
The admixture of CeO2 , Ce, CeCl3 and MoO3 with an excess LiCl as flux in evacuated silica ampules leads to large black single crystals well a microcrystalline powder Ce3 Cl3 [MoO6 ] after tempering at 850 °C for three days. title compound crystallizes the hexagonal space group P63 /m (a=934.93(4), c=538.86(2) pm) two formula units per unit cell. crystal structure consists rather unusual trigonal-prismatic ]6- besides Ce3+ ions tetra-capped coordination, formed by four Cl- six O2- ions....
Abstract Mechanically chelating ligands have untapped potential for the engineering of metal ion properties. Here we demonstrate this principle in context Co II ‐based single‐ion magnets. Using multi‐frequency EPR, susceptibility and magnetization measurements found that these complexes show some highest zero field splittings reported five‐coordinate to date. The predictable coordination behaviour interlocked allowed magnetic properties their be evaluated computationally a priori our...