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Coordination to the axial position of the metalloporphyrin Ru(TTP)(CO) is an effective means to end-cap the 1,2-bis(4,4′-dipyridinium)ethane dication·dibenzo[24]- crown-8 [2]pseudo-rotaxane and generate the stable porphyrinic [2]rotaxane 4.
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Chichak et al. (2000) studied this question.
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