Abstract
In this chapter, we initially give an overview of magnetism and briefly discuss the advantages of “organic ferromagnetism.” Next, we review the many rules and indices used for predicting ferromagnetism that are proposed in the frameworks of molecular orbital methods and valence-bond theory. We introduce two types of strategies for designing ferromagnetic systems: “inter-molecular spin alignment (molecular magnets)” and “intra-molecular spin alignment (high-spin polymers).” Finally, we mention the theoretical approaches used to understand and predict magnetism in larger systems, namely, statistical treatment using the Ising model and quantum chemistry calculations for large systems.
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