4 Questions around this concept.
Which of the following is considered as the pi- complex
These are the compounds of metals with alkenes, alkynes, benzene and other ring compounds. In these complexes, the metal and ligand form a bond that involves the electrons of the ligand. Three common examples are Zeise's salt, ferrocene and dibenzene chromium. These are shown in the figure below:

Zeise' salt Ferrocene Dibenzene chromium
The number of carbon atoms bound to the metal in these compounds is indicated by the Greek letter 'η' with a number. The prefixes η2, η5 and η6 indicate 2, 5 and 6 carbon atoms are involved in the formation of the bond with the metal atom/ion in the compound.
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Inorganic Chemistry (2nd Year Programme)
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