Delta ligands are a type of chemical ligand that can coordinate to a central metal atom or ion in a complex. They are characterized by their ability to form multiple bonds with the metal, often resulting in a stable and unique structure. Delta ligands can influence the properties of the metal complex, such as its reactivity and stability. These ligands are commonly found in coordination chemistry and play a significant role in various applications, including catalysis and materials science. Understanding delta ligands is essential for researchers working with transition metals and their complexes, as they can significantly affect the behavior of the system.