Novel host compounds, 1,1′-binaphthyl-2,2′-dihydroxy-5,5′- and 6,6′-dicarboxylic acid, which trap guest molecules tightly in their inclusion crystals

The host compounds 1,1'-binaphthyl-2,2'-dihydroxy-5,5'-dicarboxylic acid (1) and 1,1'-binaphthyl-2,2'-dihydroxy-6,6'-dicarboxylic acid (2) have been synthesized, and their inclusion properties have been studied. Inclusion complexes formed by 1 and 2 with volatile guests such as acetone and methanol release the guests only at much higher temperatures than their boiling points. The crystal structures of the inclusion complexes have been determined from single crystal X-ray diffraction data and show different host lattices.