Abstract
13C spin-lattice relaxation times of the protonated carbons in Co 3(CO) 9(μ 3-CPh) were measured as a function of temperature in the solvent chloroform. The T 1's were used to calculate the phenyl group's tumbling ( D ⊥) and spinning ( D s) rotational diffusion constants. It was observed that the ratio, D s D ⊥ > 1, revealing extremely facile internal rotation of the phenyl ring. This result is in direct contrast to earlier data on the bicapped tetracobalt cluster Co 4(CO) 10(μ 4-PPh) 2, and indicates a complete lack of steric or electronic interaction between the aromatic ring and the tricobalt nonacarbonyl skeleton. Theoretical diffusion constants calculated by the GiererWirtz Microviscosity model are in excellent agreement with experimental values of D ⊥.
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