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Which of the following organometallic compounds contains both σ-bonding and π-bonding interactions?

1. [Fe(η5-C5H5)2]
2. [PtCl3(η2-C2H4)]
3. [Co(CO)5NH3]2+
4. Al(CH3)3

Correct answer: [PtCl3(η2-C2H4)]

Solution

In [PtCl3(eta2-C2H4)]- (Zeise's anion) ethylene bonds via sigma donation from its pi orbital to Pt and pi back-donation from filled Pt d orbitals into the alkene pi* orbital, so both sigma and pi interactions are present. Ferrocene's Cp rings bond only through pi interactions.

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