Q22 · CSIR NET Chemistry, June 2021
Paper: CSIR NET June 2021 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Cluster Compounds Wade Rules · Marks: 2 · Difficulty: Medium
Identify the thermodynamically stable structure of $[(\eta^{5}-\mathrm{C2H5})\mathrm{Fe}(\mu^{2}-\mathrm{CO})(\mathrm{NO})]^{2}$
(a)
(b)
(c)
(d)
Answer
Answer: B ✓ checked by 4AB · confidence low
Explanation
Count per Fe: Cp 5 + linear NO 3 + two μ-CO (1 each) = 18, so there is no Fe–Fe bond. The stable isomer is the trans, CO-bridged dimer with linear NO, as drawn in (b).
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