Tuning Solid-State Calix[n]arene Supramolecular Assemblies Using Phenanthroline as the Guest Molecule

© 2019 American Chemical Society. Of the available ligands for the study of molecular recognition by para-sulfonato-calix[n]arene receptors, phenanthroline is proving to a far more versatile moiety than it would have initially been expected. Interactions with two anionic host molecules, para-sulfonato-calix[4]arene and para-sulfonato-calix[8]arene, have been previously examined in depth and described. In this paper, further structural studies concerning supramolecular self-assembly species of unsubstituted calix[6]arene, para-sulfonato-calix[6]arene, para-sulfonato-calix[4]arene, and 25,27-O-di(carboxymethoxy)-calix[4]arene with phenanthroline are reported. Structures of crystalline host-guest complexes were determined by means of X-ray diffraction. Diversity of the chemical makeup of the structures is observed: four structures are cocrystals and the other four are organic salts. In the packing motifs columnar systems are the commonest among those observed