Photochemical intracomplex reaction between β-cyclodextrin and anthraquinone-2,6-disulfonic acid disodium salt in water solution

1D and 2D 1H NMR studies of anthraquinone-2,6-disulfonic acid disodium salt in the β-cyclodextrin solution have identified the inclusion complex formation. The association constant of AQDS–β-CD inclusion complex was determined as 800 ± 100 M−1. The selective intra-complex photo-oxidation of β-cyclodextrin at C6 position was detected by CIDNP method.