Interactions in metal clusters

The barriers to racemization in C 2 D 4 Cl 2 of [Ir{Fe(P( p -tolyl) 2 )(CO) 2 (η 5 -C 5 H 5 )} 2 ] + BF 4 − and [Ir{Ru(P( p -tolyl) 2 )(CO) 2 (η 5 -C 5 H 5 )} 2 ] + BF 4 − are 17.5 and 17.8 kcal/mol respectively. Both clusters add H 2 reversibly at 1 atmosphere and room temperature. The former also forms an adduct with H 2 and CO when exposed to both gases simultaneously.