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The trends in carbon‐sulfur bond length for complexes of 1,4,7‐trithiacyclononane (9S3) provide compelling evidence that CS σ* orbitals accept π‐electron density from the metal. As the metal d‐orbital energy and occupancy increase, this leads ultimately to cleavage of the CS bonds with concomitant release of ethene in the Re and Tc complexes [Eq. (a)]. equation image
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Mullen et al. (1997) studied this question.
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