Carbonyl intra-exchange in hexa- and hepta-rhodium carbonyl clusters

Abstract

13 C n.m.r. studies on the three structurally related carbonyl clusters [Rh6(CO)16], [Rh6(CO)15]2– and [Rh7(CO)16]3– show that [Rh6(CO)16] is not fluxional at +70°, [Rh6(CO)15]2– readily undergoes intra-carbonyl exchange at –70° and [Rh7(CO)16]3– is not fluxional at –70° but undergoes partial intra-exchange at +25°.