Complexation is a field of study within chemistry that focuses on the formation of complexes between molecules or ions. These complexes are formed when a ligand (a molecule or ion) binds to a central metal atom or ion, creating a coordination complex. The study of complexation is important in understanding the behavior of metal ions in biological systems, environmental processes, and inorganic chemistry. Complexation reactions play a key role in various chemical and biological processes, such as catalysis, drug delivery, and metal ion detection. Research in complexation seeks to understand the formation, structure, and properties of these complexes, as well as their applications in various fields of science and technology.