Piano-stool inversion in arene complexes of Ru(II) : modelling the transition state

In the solid-state, the [RuH(arene)(Binap)]CF3SO3, complexes, 1, arene = eta(6)-benzene and 2, arene = eta(6)-toluene, distort markedly from a classical three-legged piano-stool structure with the former having the P-Ru-P plane approximately perpendicular to the plane of the arene; this structure for 1 is what one would expect for a transition state leading from one diastereomer to another via inversion at ruthenium.