Question

Give an example of hexadentate ligand.

Answer 1

Ethylenediamine tetraacetate ion is a hexadentate ligand as it has six donor sites, two nitrogen and four oxygen atoms.

\[\begin{array}{cc}
\phantom{.}\ce{\underset{\bullet\bullet}{^-O}OCCH2}\phantom{........................}\ce{CH2CO\underset{\bullet\bullet}{O^-}}\phantom{.}\\
\phantom{.}\backslash\phantom{.....................}/\phantom{.}\\
\phantom{.}\ce{\overset{\bullet\bullet}{N} - CH2 - CH2 - \overset{\bullet\bullet}{N}}\phantom{.}\\
\phantom{.}/\phantom{.....................}\backslash\phantom{.}\\
\phantom{.}\ce{\underset{\bullet\bullet}{^-O}OCCH2}\phantom{..........................}\ce{CH2CO\underset{\bullet\bullet}{O^-}}\phantom{.}\\
\phantom{..}\ce{Ethylenediaminetetraacetato (EDTA)}\phantom{}
\end{array}\]