Axiallychiral binaphthothiophene dicarboxylicacid was prepared as a novel functionalized chiraldicarboxylicacid. The crystal structures of both the racemic form and its salt with chiral diamine revealed the intramolecular S···O interactions (chalcogen bonds) between the sulfur in the naphthothiophene rings and the oxygen of the carboxy groups. The negative-positive and the positive-negative Cotton