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Exchange behaviour in the indenyl-anthracene rhenium complex 29. (i) Low-energy (Cs symmetric) up/down oscillation of the indenyl-Re(CO)3 group relative to the anthracene ring plane; (ii) higher-energy process whereby side-to-side rotation of the indenyl-Re(CO)3 moiety about the C(9)-indenyl linkage equilibrates the terminal benzo rings.
