For the first time the utility of p-sulfonatocalixarene to form a chalice-like cavity for the solid state inclusion of a classical coordination complex [Co(phen)(3)](3+) has been demonstrated. In the presence of Yb3+ ions, a new crystalline material is formed which possesses large diameter, negatively charged channels which propagate through the material in three dimensions.
Smith, C. B., Barbour, L. J., Makha, M., Raston, C., & Sobolev, A. (2006). Unlocking the elusive binding cavity in p-sulfonatocalixarene. New Journal of Chemistry, 30(7), 991-996. https://doi.org/10.1039/b604513h