Goldbook title
IUPAC > Gold Book > alphabetical index > E > η (eta or hapto) in inorganic nomenclature
Gold G Icon
Indexes Download
PREVIOUS H01881 NEXT
dypnones E, Z

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
Interactive Link Maps
First Level Second Level Third Level
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: https://doi.org/10.1351/goldbook.H01881.
Original PDF version: http://www.iupac.org/goldbook/H01881.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
Current PDF version | Version for print | History of this term
picture