A new porphyrin-containing host has an exceptionally high affinity for viologen guests, with binding constants as high as Kass = 7 × 106M–1 in organic solvents, allowing the construction of porphyrin–viologen rotaxanes.
A. E. Rowan, Chem. Commun., 1998, 611 DOI: 10.1039/A708373D
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