In idealised octahedral Mo(CO)₆₋ᵣ(PMe₃)ᵣ (r = 0,1,2), compare equivalent terminal CO groups, neglecting positional effects. PMe₃ is a stronger net σ donor and weaker π acceptor than CO. What happens a

Question

In idealised octahedral Mo(CO)₆₋ᵣ(PMe₃)ᵣ (r = 0,1,2), compare equivalent terminal CO groups, neglecting positional effects. PMe₃ is a stronger net σ donor and weaker π acceptor than CO. What happens as r increases?

TestHub · Accepted Answer

PMe₃ increases electron density available for Mo→CO back-donation and leaves fewer CO acceptors competing for it. This weakens C−O, lowering its frequency, and strengthens Mo−C, shortening that bond.

Chemistry - Coordination Chemistry Question with Solution | TestHub

Options:

Doubts & Discussion