UPSC Combined Geo-Scientist, Mains · 2021 · Mains Paper I
Q9(b). Quadruple bonding in octachlorodirhenate
Question
How would you account for metal-metal bonding in [Re₂Cl₈]²⁻ with the help of MO approach?
Answer in brief
Two Re(III), d⁴ centres supply eight metal-based electrons: σ²π⁴δ², giving a Re-Re quadruple bond and diamagnetism.
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Coversquadruple bond[Re2Cl8]2-metal-metal bonddelta bondmolecular orbital theoryeclipsed conformation
All parts of Question 9
- 9(a)(i) Catalytically useful features of Wilkinson’s complex5 marks
- 9(a)(ii) Alkene hydrogenation by Wilkinson’s catalyst10 marks
- 9(b) Quadruple bonding in octachlorodirhenate15 marks