Macrocyclic porphyrin dimers linked by biphenyl or pyromellitimide bridges show major conformational changes on protonation or on binding a single 1,4-diazabicyclo[2.2.2]octane (DABCO) molecule within the cavity; the binding of a second DABCO molecule leads to a further conformational switch.
C. A. Hunter, M. N. Meah and J. K. M. Sanders, J. Chem. Soc., Chem. Commun., 1988, 694 DOI: 10.1039/C39880000694
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