Q86 · CSIR-NET Chemistry, June 2011

Paper: CSIR-NET June 2011 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Cluster Compounds Wade Rules · Marks: 2 · Difficulty: Easy

In the $\mathrm{H}_{2} \mathrm{Ru}_{6}(\mathrm{CO})_{18}$ cluster, containing 8-coordinated Ru centers, the hydrogen atoms are
(a)Both terminal
(b)One terminal and the other bridging
(c)Both bridging between two Ru centers
(d)Both bridging between three Ru centers.
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
In H₂Ru₆(CO)₁₈ the hydrides cap triangular faces of the octahedron (μ₃-H), which is what makes the Ru centres formally eight-coordinate.

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