Formation and photoinduced processes of the host-guest complexes of a β-cyclodextrin-conjugated aza-BODIPY and tetrasulfonated porphyrins

A bis(permethylated beta-cyclodextrin)-substituted aza-BODIPY has been prepared, which forms stable 1 : 1 host-guest complexes with metal-free and zinc(II) tetrasulfonated porphyrins in water. The resulting complexes exhibit predominantly a photoinduced energy or electron transfer process depending on the porphyrin-based guest.