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From intellectual curiosity to versatile supramolecular tool, the ascension of the halogen bond has been significant. In less than 20 years since the “rediscovery” concept article, the works of many scientists have produced a solid foundational understanding of the halogen bond. The wide breadth of fundamental studies of the halogen bond across all phases (solid, solution, gas, and in silico) has resulted in extensive (and growing) application across diverse fields. Furthermore, the success of the halogen bond has inspired a renaissance of other σ‐hole‐type interactions (e.g. chalcogen, pnictogen, and tetrel bonds) that have developed rapidly, as concepts, nomenclature, and fundamentals parallel the halogen bond.

The rise of these noncovalent forces has expanded the supramolecular landscape. As such, readers should continue to expect comparative investigations on how the halogen bond “stacks up” against other noncovalent interactions – some of which will be discussed in later chapters. These and other fundamental studies will continue to refine our understanding of the halogen bond. As the field advances, enriched understanding and computational models will lead to improved molecular designs – the prospects of which are vast. The intent of this introduction has been to provide a deeper understanding of the halogen bond that can be used to contextualize the solution discussions found in later chapters. The following chapters highlight fundamental and functional studies of the halogen bond in solution.