Molecular magnetism occupies a crossing point between two fields of research-materials science and metal biochemistry - and plays an important role in the field of molecular electronics. The \"Fundamentals of molecular magnetism\" is the textbook to comprehensively address both the experimental and theoretical aspects of the relatively new field of research. It introduces the basic concepts concerning magnetization and magnetic susceptibility, establishes the fundamental equations of molecular magnetism and examines molecules containing a unique magnetic center, including the highspinlow- spin transition compounds. The textbook highlights polymetallic species, reviews the phenomenon of interaction between spin carriers from a theoretical point of view and includes numerous examples throughout to illustrate the topics discussed. An essential part of the textbook is devoted to novel class of magneto active materials- single molecular magnets (SMMs).

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I. Introduction......4II. History of Magnetic measurements......6III. Basic concepts......7III.1. Magnetisation and Susceptibility......7III.2. Diamagnetism......9III.3. Paramagnetism. The Curie and Curie–Weiss Laws......12IV. Orbital Angular Momentum......18IV.1. Ligand Field Quenching of Orbital Angular Momentum......19IV.2. Explanation of Ligand Field Quenching......20IV.3. Spin-Orbit Coupling......22IV.4. Rare Earth Ions......24V. The Van Vleck equation......26V.1. Application of the Van Vleck Formula to an Isolated
Spin-Only Metal Complex......27V.2. Deviations from the Curie Law: Zero-Field Splitting......28VI. Electron Paramagnetic Resonance (EPR)......30VII. Low-Spin-High-Spin Transition......35VII. 1. High-Spin Molar Fraction versus Temperature Curves for Spin Transition Compounds......37VII.2. Mechanism of the Spin Transition at the Molecular Scale......38VII. 3. Spin Transition and Cooperativity......43VII.4. Regular Solution Model......45VII.5. Domain Model......53VII.6. Some Selected Examples......56VII.6. 1. d4 Ions......56VII.6. 2. d5 Ions......58VII.6. 3. d6 Ions......61VII.6. 4. d7 Ions......69VII.7. Spin Transition and Molecular Electronics......71VIII. Isotropic Interaction in Dinuclear Compounds......74VIII.1. Copper(ll) Dinuclear Compounds......74VIII.2. Other Symmetrical Dinuclear Compounds......85VIII.3. Asymmetrical Dinu clear Compounds......94VIII.4. Influence of the Local Anisotropy......101VIII.5. Intermolecular Interactions between Dinuclear Units......108IX. Single Molecule Magnets......110IX.1. Introduction......110IX.2. A Brief Introduction to the Physics of SMMs......111IX.3. Further SMMs Based on Mn(III)......115IX.3.1. The largest SMM; a Mn84 torus......115IX.3.2. Record spin number
ST 83/2
but no slow relaxation......116IX.3.3. Record magnetic anisotropy barrier; a Mn6 cluster......117IX.3.4. Quantum entanglement between SMMs; first discovered in a pair of Mn4 clusters......117IX.3.5. MnIII 3 MnIV clusters with an S 9/2 ground state......118IX.3.6. The MnIII 2 MnII 2 family of “rhombic” SMMs......121IX.3.7. Oxime bridged SMMs with the core MnIII 3O and ST 6......125IX.3.8. Magnetostructural correlations within a family of MnIII 6 SMMs......128IX.4. MMs Based on Fe(III) Ions......131IX.5. New SMMs Based on Divalent 3d-Ions......132IX.6. Slow Relaxation in Complexes Involving 4f-Elements......139IX.6.1. Single atom magnets......139IX.6.2. Polymetallic 4f-complexes......140IX.6.3. Heterometallic 3d-4f SMMs......142IX.7. Metallocyanate Based SMMs......147IX.8. Conclusions......148X. Exercises......149References......155