Key points are not available for this paper at this time.
Anions included: A series of meso-tetraaryl calix4pyrrole receptors have been used as a model system to quantify chloride–π interactions in solution (see picture; green balls are chloride ions). The free energy values are generally indicative of a repulsive interaction; their magnitude depends on the substituent on the aromatic ring.
Gil‐Ramírez et al. (Mon,) studied this question.