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Showing 1 to 19 of 19 for “"Single-Molecule Magnets"”.
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New routes to single molecule magnets
… are of particular interest for the generation of single molecule magnet (SMM) behaviour. The product family includes a Co4 SMM cluster, a Co6 SMM cluster and a 3D network of linked SMM units. A new route to the erinaceous Co6 cluster crystals is reported, which allows further investigation of the …
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Magnetization dynamics of single molecule magnets
Made available in DSpace on 2014-09-16T17:25:53Z (GMT). No. of bitstreams: 2 Yun_Liu.pdf: 2936489 bytes, checksum: 870b4bdf8c282c749cf14f4925088600 (MD5) license.txt: 4056 bytes, checksum: c0d6bd6324ecaf18c5d2647589f9beff (MD5)
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Ligand Design for Dual Property Single Molecule Magnets
… Ln(III) ions for the assembly of emissive single molecule magnets, and secondly the preparation and coordination of a chiral mpmH ligand with selected 3d transition metal ions, working towards the discovery of chiral polynuclear clusters. In Project 1, the coordination chemistry of the TBC4 …
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Electron Transport via Single Molecule Magnets with Magnetic Anisotropy
Single molecule magnets (SMMs) are molecules of mesoscopic scale which exhibit quantum properties such as quantum tunneling of magnetization, quantum interference, spin filtering effects, strong spin-phonon coupling and strong hyperfine Stark effects. These effects allow applications of SMMs to …
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Lanthanide-based single-molecule magnets: A rational design by chemical intuition
… like aromaticity on the observation of single-molecule magnet (SMM) behaviour in a lanthanide-based complex (Dy1). Experimental techniques were combined with theoretical tools to investigate the dynamics of magnetic properties of the Dy1 and compared with the theoretical results for Dy2 …
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High-Nuclearity Lanthanide(III) Complexes as Single-Molecule Magnets and Luminescent Materials
… Solid-state and solution studies revealed single-molecule magnetism (SMM) and photoluminescence behaviors. Moreover, in order to investigate the steric and stereoisomerism effects of the ligand on the chemical and structural identity of the {Ln7} clusters, the pure trans-analogue of the …
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The synthesis and characterisation of polymetallic transition metal complexes towards single-molecule magnets
The synthesis and characterisation of sixteen new complexes are reported. The use of the ligand edte (((HOCH2CH2)2NCH2CH2N(CH2CH2OH)2)), H4L1) has resulted in five new iron complexes. Two Fe6 complexes and an Fe3 complex display non-zero ground states of S = 5 and S = 3 respectively. An Fe12 …
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Polynuclear 3d/4f-Metal Complexes as Molecular Magnetic Refrigerants and Single-Molecule Magnets
… interesting magnetic properties, specifically single-molecule magnetism and the magnetocaloric effect. In this thesis, Chapter 1 lays the foundation for the research presented within. This section covers the fundamentals of polynuclear metal complexes, molecular magnetism, and the …
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Investigating and Enhancing Spin Reversal Barriers in Dinuclear 4f Single-Molecule Magnets and the Ultimate Shift to Mononuclear 3d Complexes
… and high blocking temperatures. In the field of Single-Molecule Magnets (SMMs), over the last decade, the main focus has shifted from large spin complexes to highly anisotropic systems which have displayed record energy barriers. There are two main methods of increasing magnetic anisotropy in a …
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Revisiting physics of quantum bits
… purposes, the effective Hamiltonian of single molecule magnets in interaction with a spin bath differs from the commonly quoted result in the literature. It is also shown that the topological effects in such problems are as small as transitional effects to higher excited states beyond …
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Effects of Electron-Vibron Coupling in Single-Molecule Magnet Transport Junctions Using a Hybrid Density Functional Theory and Model Hamiltonian Approach
… shown that junctions consisting of individual single-molecule magnets (SMMs) bridged between two electrodes can be fabricated in three-terminal devices, and that the characteristic magnetic anisotropy of the SMMs can be affected by electrons tunneling through the molecule. Vibrational modes of …
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Multiscale Insights into Molecular Interfaces: STM Imaging and Ultrafast Laser-Induced Dynamics
… in complex molecular systems, including single-molecule magnets. Overall, the work highlights the power of combining scanning probe microscopy, vibrational spectroscopy, and ultrafast laser methods for comprehensive understanding of functional molecular assemblies and light-matter …
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Dipolar Interactions, Long Range Order and Random Fields in a Single Molecule Magnet, Mn12-acetate
… I will present an experimental study of two single molecule magnets, Mn<sub>12</sub>-ac and Mn<sub>12</sub>-ac-MeOH. I will show that in both systems, the temperature dependence of the inverse susceptibility yields a positive intercept on the temperature axis (a positive Weiss temperature), …
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Remaining Unperturbed by the Vibrational Response: Probing Vibrational Coupling, Relaxation, and Solvent Effects with 2D IR Spectroscopy
… ligand that is relevant to spin relaxation in single-molecule magnets. In both of these works, 2D IR is utilized to reveal vibrational coupling and energy transfer pathways across the molecular scaffold. The last project that will be discussed is on the detection of localized solvation …
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Efficient Fock Space Configuration Interaction Approaches For Large Strongly Correlated Systems
Over the past few decades, single-molecule magnets (SMMs) have been an area of significant interest due to their plethora of potential uses, including possible applications to quantum computing and compact data storage devices. Although theoretical chemistry calculations could aid our understanding …
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Use of Oximes and Schiff-bases as Bridging/Chelating Ligands with Select 3d and 3d/4f Ions in Cluster Chemistry and a Mechanistic Insight into the Roles of Transition Metal Ions in the Formation of Tetrazoles
The employment of acenaphthenequinone dioxime (acndH2), 9,10-phenanthrenedione-9-oxime (phenoxH), 9,10-phenanthrenedione-9,10-dioxime (phendoxH2), and N-naphthalidine-2-amino-naphthol (nanpH2) in homometallic 3d- and heterometallic 3d/4f-metal cluster chemistry has afforded a Mn cluster and novel …
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Magnetically Interesting Coordination Complexes Based on Macrocyclic Ligands
… and study of new families of macrocyclic-based single molecule magnets (SMMs). Chapter 1 introduces the general theory of magnetism, molecular magnetism and SMMs and provides the reader with a brief overview of the relevant coordination chemistry of the two families of macrocycles. In Chapter 2, …
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Exploring the Structural, Magnetic, Optical, and Catalytic Properties of High-Spin Materials
This thesis explores the design, synthesis, and characterization of lanthanide-based coordination frameworks (MOFs) and heterometallic 3d/4f complexes, with a focus on tunable magnetic behavior, photophysical properties, and catalytic performance. Four complementary research directions were …
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Tunable High-Field/ High-Frequency ESR and High-Field Magnetization on Single-Molecule Clusters
In this work, low dimensional iron group clusters have been studied by application of high magnetic fields. The magnetization has been probed with an MPMS as function of temperature and field. The combination with pulse field measurements up to 52\,T allowed determination of the magnetic exchange …