Chelation binds multiple donor sites of one ligand to the same central atom, forming a chelate ring. It can retain a donor near a metal even when one attachment temporarily opens.
A coordination ligand that coordinates one metal through three donor atoms. A facial tridentate donor set occupies the vertices of one face of an octahedron.
Enhanced complex stability associated with donor sites being held in a macrocycle, relative to comparable open-chain ligands. The comparison depends on donor geometry, solvation and strain.
The donor–metal–donor angle imposed by a chelating ligand. Tether length, ring conformation, donor distances and substituent crowding all influence it.
The chelate effect is the enhanced stability often associated with binding several donor sites from one ligand compared with comparable independent donors. Solvent release, effective local concentration and enthalpic contributions all matter; it is not simply a consequence of satisfying an electron-count rule.
A chelate ring is a closed bonded path containing the central atom and a ligand with multiple attachments to it. A tethered Cp–pyridyl ligand can close such a path when the pyridyl N coordinates.

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