Question

Select the I.U.P.A.C. name for $Fe(\pi -C_5{H}_5{)}_2$ :

• A. bis$({\eta }^6$-cyclopentadienyl$)$ iron$\left(II\right)$
• B. bis$({\eta }^5$-cyclopentadienyl$)$ ferrate$\left(II\right)$
• C. bis$({\eta }^5$-cyclopentadienyl$)$ iron$\left(0\right)$
• D. bis$({\eta }^5$-cyclopentadienyl$)$ iron$\left(II\right)$

Answer 1

The correct option is D bis$({\eta }^5$-cyclopentadienyl$)$ iron$\left(II\right)$

The I.U.P.A.C. name for $Fe(\pi -C_5{H}_5{)}_2$ is bis$({\eta }^5$-cyclopentadienyl$)$ iron$\left(II\right)$

The oxidation state of iron is $+2$ and is written in parenthesis in roman numerals. Two cyclopentadienyl ligands are coordinated to $Fe$. The prefix bis indicates $2.{\eta }^5$ indicates that the cyclopentadienyl ligands are penta coordinate.