Abstract

13C and 13C- 103Rh} data on [Rh 6(CO) 15C] 2− and [Rh 6(CO) 13C] 2− are reported and compared. [Rh 6(CO) 13C] 2− undergoes a unique facile intramolecular CO migration around the equator of the Rh 6 octahedron; at 25°C, [Rh 6(CO) 15C] 2− undergoes preferential intermolecular CO exchange at sites which have the longest RhCO bonds and direct exchange of terminal carbonyls is easier than edge-bridging carbonyls with approximately similar RhCO bond lengths.

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