Step 1: Ferrocene Composition Ferrocene, represented as \({Fe}(\eta^5 - {C}_5{H}_5)_2\), comprises two \(\eta^5\)-cyclopentadienyl ({Cp}$^-$) anions coordinated to an Fe$^{2+}$ ion.
This arrangement results in a "sandwich" configuration, with the iron atom situated between two parallel Cp rings.