compound A having the composition FeC9H8O3 shows one signal at 2.5 ppm and another one around 5.0 ppm in it’s 1H NMR spectrum. The IR spectrum of this compound shows two bands around 1900 cm-1 and 1680 cm-1. The compound follows the 18 electrons rule of the following statements for A, the correct one is/are(A) it has n5Cp group.(B) it has a terminal CO ligand.(C) it has a CH3 ligand.(D) it has Fe-H bond.
Question
compound A having the composition FeC9H8O3 shows one signal at 2.5 ppm and another one around 5.0 ppm in it’s 1H NMR spectrum. The IR spectrum of this compound shows two bands around 1900 cm-1 and 1680 cm-1. The compound follows the 18 electrons rule of the following statements for A, the correct one is/are(A) it has n5Cp group.(B) it has a terminal CO ligand.(C) it has a CH3 ligand.(D) it has Fe-H bond.
Solution
The compound A is Ferrocene carboxaldehyde, which is an organometallic compound with the formula Fe(C5H5)(C5H4CHO).
(A) It has η5-Cp group: This is correct. The compound has two cyclopentadienyl (Cp) rings which are η5-bonded to the iron atom.
(B) It has a terminal CO ligand: This is incorrect. The compound does not have a carbonyl (CO) ligand.
(C) It has a CH3 ligand: This is incorrect. The compound does not have a methyl (CH3) ligand.
(D) It has Fe-H bond: This is incorrect. The compound does not have an iron-hydrogen (Fe-H) bond.
Therefore, the correct statement is (A) it has η5-Cp group.
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