Hexadentate

Part of speech: adjective

Definitions

1. A molecular structure exhibiting six coordination sites that allows a chelating agent to effectively bind with metal ions for enhanced stability
2. A ligand that can form six bonds with a metal ion, thereby creating a more stable and reactive coordination complex
3. Describes a chemical ligand capable of attaching to a central atom through six separate points of contact

Etymology: Hexadentate is a chemistry term for a ligand that binds to a central metal atom through six separate donor sites, forming six bonds to it. The word is built from two parts. "Hexa-" comes from the Greek "hex," meaning six, and "dentate" comes from the Latin "dentatus," meaning toothed, from "dens," tooth. The image is of a molecule with six "teeth" that grip a metal ion at once. The "dentate" element is the key to the chemistry. In coordination chemistry, a ligand's denticity counts how many of its atoms attach to the central atom, so a molecule that bonds at one point is monodentate, and one with six such points is hexadentate. The biting metaphor is a deliberate one: the ligand clamps onto the metal as a jaw would close around an object.