A Receptor for Aromatic Acids and Amides.

A dinitrotoluic residue has been introduced onto an hydrogen bonding aromatic acid receptor to achieve stacking and charge-transfer interactions. This new receptor shows large differences in association constants with aromatic guests in CDCl3 ranging from 1.6 × 103 with isophthalic acid methyl ester to 1.5 × 106 with p-dimethylamino benzoic acid.