Complexation and photodimerization of anthracene-2-sulfonate in the presence of per-6-aminocyclodextrins

Abstract

The stoichiometry of molecular complexation of anthracene-2-sulfonate (AS) with hexakis-, heptakis and octakis-(6-amino-2,3-di-O-methyl-6-deoxy)cyclodextrins (α-, β- and γ-PACDs) has been investigated by UV, fluorescence, and circular dichroism spectrophotometry; in neutral and alkaline media only β-PACD gives the 2 : 2 inclusion complex, while in sufficiently acidic media all PACDs form the inclusion complexes by benefitting greatly from electrostatic interactions. The relative rates for the PACD-promoted photodimerization are closely related to the complexation modes.