Q65 · CSIR-NET Chemistry, December 2011
Paper: CSIR-NET December 2011 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Marks: 2 · Difficulty: Easy
The stable cyclopentadienyl complex of beryllium is
(a)$\left[\mathrm{Be}\left(\eta^{2}-\mathrm{C}_{5} \mathrm{H}_{5}\right)_{2}\right]$
(b)$\left[\mathrm{Be}\left(\eta^{2}-\mathrm{C}_{5} \mathrm{H}_{5}\right)\left(\eta^{3}-\mathrm{C}_{5} \mathrm{H}_{5}\right)\right]$
(c)$\left[\mathrm{Be}\left(\eta^{1}-\mathrm{C}_{5} \mathrm{H}_{5}\right)\left(\eta^{3}-\mathrm{C}_{5} \mathrm{H}_{5}\right)\right]$
(d)$\left[\mathrm{Be}\left(\eta^{1}-\mathrm{C}_{5} \mathrm{H}_{5}\right)\left(\eta^{5}-\mathrm{C}_{5} \mathrm{H}_{5}\right)\right]$
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
Beryllocene is the slipped sandwich [Be(η¹-C₅H₅)(η⁵-C₅H₅)]: one ring π-bound, the other σ-bound through one carbon.
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