Paper: CSIR-NET June 2012 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Marks: 2 · Difficulty: Medium
The carbonyl resonance in $^{13}\mathrm{C}$ NMR spectrum of $\left[(\eta^{5}\text{-}\mathrm{C}_5\mathrm{H}_5)\mathrm{Rh}(\mathrm{CO})\right]_3$ ($^{103}\mathrm{Rh}$, nuclear spin, $I = 1/2$, 100\%) shows a triplet at $-65^{\circ}\mathrm{C}$ owing to the presence of
(a)Terminal CO
(b)$\mu_{2}-\mathrm{CO}$
(c)$\mu_{2}-\mathrm{CO}$
(d)$\eta^{5}-\mathrm{C}_{5} \mathrm{H}_{5}$
Answer
Answer: B ✓ checked by 4AB · confidence medium
Explanation
A triplet (1 : 2 : 1) arises from coupling to two equivalent ¹⁰³Rh — a μ₂-bridging CO (b).