[J]

Hi,

I am studying pi-arene ligands and there bonding to transition metals (in this case ruthenium)

I have been studying the "piano stool" structure of the compound (η6-p-cymene)RuCl2(PPh3) and was wondering the reasons why the Ru-C bonds are longer than in e.g. [(η6-p-cymene)RuCl2]2.

I'm sure it has something to do with the PPh3 ligand but I am unable to justify this.

Any help on this would be greatly appreciated.

J