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A Greek eta with a raised numeral, before a ligand's name.
Also known as: Hapticity, Eta notation, Pentahapto, Greek n with a superscript
η⁵ says five contiguous atoms of a ligand are bonded to the metal — ferrocene's cyclopentadienyl rings are η⁵. It counts adjacent atoms in one continuous run, which is what distinguishes it from denticity's kappa.
Denotes hapticity: the number of contiguous ligand atoms coordinated to a metal centre.
Contexts: Laboratory
Requires the coordinating atoms to be adjacent in the ligand, unlike denticity, which counts binding sites wherever they are.
Contexts: Laboratory
Is written with a raised numeral on the eta and is read aloud as 'eta-five' or 'pentahapto'.
Contexts: Laboratory
A Greek lowercase eta — an arch with a descending stroke on its right — carrying a small raised numeral.