IUPAC > Gold Book > alphabetical index > E > η (eta or hapto) in inorganic nomenclature
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η (eta or hapto)
in inorganic nomenclature
An affix giving a topological indication of the bonding between a π-electron ligand and the central atom in a coordination entity. A right superscript numerical index indicates the number of ligating atoms in the π-electron system of the ligand which bind to the central atom. Examples:
  1. [Fe(CO)3(C4H6SO)], tricarbonyl(η2-dihydrothiophene 1-oxide-κO)iron.
  2. [Cr(CO)4(C4H6)], tetracarbonyl(η4-2-methylene-1,3-propanediyl)chromium.
Source:
Red Book, p. 202
See also:
Blue Book, p. 465
PAC, 1994, 66, 1077 (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1120
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Cite as: IUPAC Compendium of Chemical Terminology, Electronic version, http://goldbook.iupac.org/H01881.html.
Transformed and rewritten from PDF version (entry http://www.iupac.org/goldbook/H01881.pdf)
by: Miloslav Nic, Jiri Jirat, Bedrich Kosata, ICT Prague, Czech Republic
Version for print | History of this term
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