Buckybinding: The selective binding of either C60 and C 70 in a mixture of the two fullerenes occurs by proton-induced, reversible, and controllable morphological switching between receptors for different fullerenes (see picture). Using hydrogen bonding as the exchange reaction, the response of the naphthalenediimide (NDI) building blocks to the presence of fullerene guests depends on the concentration of protons as a third component.
Stefankiewicz, A. R., Tamanini, E., Pantos, G. D., & Sanders, J. K. M. (2011). Proton-driven switching between receptors for C60 and C70. Angewandte Chemie-International Edition, 50(25), 5725-5728. https://doi.org/10.1002/anie.201100806