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A Greek kappa with a raised numeral, before a ligand's name.
Also known as: Denticity, Kappa notation, Chelation notation, Bidentate notation
κ notation counts how many separate points a ligand grips the metal at, and unlike hapticity those points need not be adjacent. EDTA is a κ⁶ ligand: six binding atoms spread across the molecule.
Denotes denticity: the number of donor atoms of a ligand bound to a single metal centre, whether or not they are adjacent.
Contexts: Laboratory
Differs from hapticity in permitting non-contiguous donor atoms, which is why chelating ligands are described with kappa rather than eta.
Contexts: Laboratory
Underlies the chelate effect: a multidentate ligand binds far more strongly than the equivalent number of separate ligands.
Contexts: Laboratory
A Greek lowercase kappa — a vertical stroke with two short diagonal strokes meeting it — carrying a small raised numeral.