| |
| |
| Preface | |
| |
| |
| |
| Supramolecular Polymetallic 2D [n � n] Transition Metal Grids - Approaches to Ordered Molecular Assemblies and Functional Molecular Devices | |
| |
| |
| |
| |
| Convergent Self-assembly | |
| |
| |
| |
| Introduction and overview | |
| |
| |
| |
| Polytopic ligands for [n � n] square grids-design and self-assembly | |
| |
| |
| |
| Thermodynamic aspects of the formation of convergent self-assembled grid architectures | |
| |
| |
| |
| Ligands and Complexes | |
| |
| |
| |
| Ditopic ligands and their complexes | |
| |
| |
| |
| Homometallic complexes | |
| |
| |
| |
| [2�2] grids with heterocyclic diazine (N<sub>2</sub>) bridging ligands | |
| |
| |
| |
| Ditopic ligands with more remote coordination pockets | |
| |
| |
| |
| Other polynuclear oligomers with remote ditopic ligands | |
| |
| |
| |
| [2 � 2] grids with single atom �-O and �-S bridging ditopic ligands | |
| |
| |
| |
| Ditopic hydrazone ligands with both �-O or �-NN bridging modes | |
| |
| |
| |
| Higher order oligomeric clusters based on ditopic ligands | |
| |
| |
| |
| Heterometallic [2 � 2] and mixed spin state grids | |
| |
| |
| |
| Symmetric tritopic ligands and their complexes | |
| |
| |
| |
| Homometallic [3 � 3] grids | |
| |
| |
| |
| Heterometallic and mixed spin state [3�3] grids | |
| |
| |
| |
| Tetratopic ligands and complexes | |
| |
| |
| |
| Homometallic [4 � 4] grids | |
| |
| |
| |
| Pentatopic ligands and their complexes | |
| |
| |
| |
| Homometallic [5 � 5] grids | |
| |
| |
| |
| Other Oligomers in the Assembly Process | |
| |
| |
| |
| Incomplete grids, clusters and chains | |
| |
| |
| |
| Nano-scale Molecular-Based Devices? | |
| |
| |
| |
| Conclusions and Future Perspectives | |
| |
| |
| References | |
| |
| |
| |
| Recent Synthetic Results Involving Single Molecule Magnets | |
| |
| |
| |
| |
| Introduction | |
| |
| |
| |
| A Brief Introduction to the Physics of SMMs | |
| |
| |
| |
| Further SMMs Based on Mn(III) | |
| |
| |
| |
| The largest SMM; a [Mn<sub>84</sub>] torus | |
| |
| |
| |
| Record spin number, S<sub>T</sub> = 83/2, but no slow relaxation | |
| |
| |
| |
| Record magnetic anisotropy barrier; a Mn<sub>6</sub> cluster | |
| |
| |
| |
| Quantum entanglement between SMMs; first discovered in a pair of Mn<sub>4</sub> clusters | |
| |
| |
| |
| [Mn<sub>3</sub><sup>III</sub> Mn<sup>IV</sup>] clusters with an S = 9/2 ground state | |
| |
| |
| |
| The [Mn<sub>2</sub><sup>III</sub> Mn<sub>2</sub><sup>II</sup>] family of "rhombic" SMMs | |
| |
| |
| |
| Oxime bridged SMMs with the core [Mn<sub>3</sub><sup>III</sub>O] and S<sub>T</sub> = 6 | |
| |
| |
| |
| Magnetostructural correlations within a family of [Mn<sub>6</sub><sup>III</sub>] SMMs | |
| |
| |
| |
| MMs Based on Fe(III) Ions | |
| |
| |
| |
| New SMMs Based on Divalent 3d-Ions | |
| |
| |
| |
| Slow Relaxation in Complexes Involving 4f-Elements | |
| |
| |
| |
| Single atom magnets | |
| |
| |
| |
| Polymetallic 4f-complexes | |
| |
| |
| |
| Heterometallic 3d-4f SMMs | |
| |
| |
| |
| Metallocyanate Based SMMs | |
| |
| |
| |
| Conclusions | |
| |
| |
| References | |
| |
| |
| |
| The Nanoscopic V<sub>15</sub> Cluster: A Unique Magnetic Polyoxometalate | |
| |
| |
| |
| |
| The Unique Magnetic Polyoxometalate V<sub>15</sub> | |
| |
| |
| |
| Structure and Superexchange Pathways | |
| |
| |
| |
| Exchange Interactions within the Triangle Model | |
| |
| |
| |
| Isotropic exchange within the triangle model | |
| |
| |
| |
| �Accidental' degeneracy and spin-frustration | |
| |
| |
| |
| Pseudo-angular momentum representation | |
| |
| |
| |
| Antisymmetric exchange, zero-field splitting | |
| |
| |
| |
| Ab initio calculations | |
| |
| |
| |
| Zeeman Levels, Magnetic Anisotropy | |
| |
| |
| |
| Electron Paramagnetic Resonance | |
| |
| |
| |
| EPR spectrum of V<sub>15</sub>: Role of antisymmetric exchange and selection rules | |
| |
| |
| |
| Discussion of the experimental EPR data | |
| |
| |
| |
| Static Magnetization | |
| |
| |
| |
| The theoretical model | |
| |
| |
| |
| Discussion of the experimental magnetization data | |
| |
| |
| |
| Dynamic Properties, Relaxation, Spin Dynamics | |
| |
| |
| |
| Relaxation mechanisms and magnetic hysteresis | |
| |
| |
| |
| Spin dynamics in the muon scattering experiment | |
| |
| |
| |
| Rabi oscillations and implementation of molecular magnets in quantum computing | |
| |
| |
| |
| Spin-vibronic Interaction | |
| |
| |
| |
| Hamiltonian of spin-vibronic coupling | |
| |
| |
| |
| Adiabatic surfaces | |
| |
| |
| |
| Influence of the Jahn-Teller effect on the magnetization | |
| |
| |
| |
| Estimation of the vibronic parameters for V<sub>15</sub> | |
| |
| |
| |
| Role of Structural Deformations | |
| |
| |
| |
| Zero-field splitting in a scalene triangular system | |
| |
| |
| |
| Discussion of inelastic neutron scattering experiments | |
| |
| |
| |
| Energy pattern of a scalene triangular system | |
| |
| |
| |
| Magnetic properties of the scalene systems | |
| |
| |
| |
| Field induced Jahn-Teller instability | |
| |
| |
| |
| NMR Experiments | |
| |
| |
| |
| Conclusions and Outlook | |
| |
| |
| References | |
| |
| |
| |
| Neutron Spectroscopy of Molecular Nanomagnets | |
| |
| |
| |
| |
| Introduction | |
| |
| |
| |
| Neutron Scattering: Basics Principles | |
| |
| |
| |
| Neutron scattering cross section | |
| |
| |
| |
| Nuclear scattering | |
| |
| |
| |
| Magnetic scattering | |
| |
| |
| |
| The time-of-flight technique | |
| |
| |
| |
| Exchange Interaction: A Spectroscopic Measurement | |
| |
| |
| |
| Spin dynamics in antiferromagnetic molecular rings | |
| |
| |
| |
| Elementary excitations in antiferromagnetic rings | |
| |
| |
| |
| Probing Quantum Coherence | |
| |
| |
| |
| Tunneling of the N�el vector | |
| |
| |
| |
| Quantum oscillations of the total spin | |
| |
| |
| |
| Zero-Field Splitting Anisotropy in High Spin Clusters | |
| |
| |
| |
| The giant spin approximation and beyond | |
| |
| |
| |
| Beyond the giant spin approximation | |
| |
| |
| References | |
| |
| |
| |
| Recent Developments in EPR Spectroscopy of Molecular Nanomagnets | |
| |
| |
| |
| |
| Beyond the Giant Spin Approximation (GSA) | |
| |
| |
| |
| Discrete Clusters-of-Clusters | |
| |
| |
| |
| Pulsed EPR | |
| |
| |
| References | |
| |
| |
| |
| Simulating Computationally Complex Magnetic Molecules | |
| |
| |
| |
| |
| Introduction | |
| |
| |
| |
| Scope and purpose | |
| |
| |
| |
| Introduction to the Heisenberg Hamiltonian | |
| |
| |
| |
| Usefulness and limitations of matrices | |
| |
| |
| |
| Quantum Monte Carlo Simulations | |
| |
| |
| |
| Avoiding the 'roadblock' of large matrices | |
| |
| |
| |
| Energy spectrum for symmetric rings | |
| |
| |
| |
| Applications to heterometallic rings | |
| |
| |
| |
| Applications to frustrated magnetic molecules | |
| |
| |
| |
| Classical Spin Dynamics Simulations | |
| |
| |
| |
| The classical heisenberg hamiltonian | |
| |
| |
| |
| Classical Monte Carlo simulations | |
| |
| |
| |
| The spin equations of motion | |
| |
| |
| |
| Heat bath simulational methods | |
| |
| |
| |
| Revealing novel physics in magnetic molecules with classical methods | |
| |
| |
| |
| Competing spin phases and exchange disorder in the Keplerate type molecules {Mo<sub>72</sub>Fe<sub>30</sub>} and {Mo<sub>72</sub>Cr<sub>3o</sub>} | |
| |
| |
| |
| Metamagnetic phase transitions in magnetic polytopes | |
| |
| |
| |
| Critical slowing-down in Heisenberg magnetic molecules | |
| |
| |
| |
| Summary | |
| |
| |
| References | |
| |
| |
| Index | |