A dinuclear ruthenium complex, [(η(5)-indenyl)Ru(CO)(2)](2), was noncovalently enclathrated within a self-assembled coordination cage. In the cavity, rapid cis-trans isomerization and ligand exchange between the terminal and bridging carbonyls were suppressed, and only the carbonyl-bridged cis configuration was observed by X-ray crystallographic analysis.
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Horiuchi et al. (2011) studied this question.
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