Inclusion compounds of isomeric xanthenol hosts with aniline

Abstract

Two isomeric xanthenol host compounds have been found to form inclusion compounds with aniline (ANI). These hosts are H1 = 9-(4-methoxyphenyl)-9H-xanthen-9-ol and H2 = 9-(3-methoxyphenyl)-9H-xanthen-9-ol. We have elucidated the structures of the inclusion compounds and determined their kinetics of desolvation. H1·½ANI crystallises in the triclinic space group P with the host in general positions and the aniline guest on a centre of symmetry. H2·ANI was solved successfully in the monoclinic space group P2₁/c with both the host and guest molecules in general positions. For H1·½ANI there is (Host)–OH⋯O–(Host) hydrogen bonding whereas in H2·ANI (Host)–OH⋯N–(Guest) hydrogen bonding occurs. We have correlated the structures with the thermal stabilities of these compounds.