Effect of α- and β-cyclodextrins on the intramolecular charge transfer and intramolecular proton transfer fluorescence of methyl o-hydroxy p-dimethylaminobenzoate

► Fluorophore is entrapped in the β-CD to form inclusion complex in the ground state, while no complexation with α-CD has occurred. ► For methyl o-hydroxy p-dimethylaminobenzoate in α- and β-CD, both 1:1 and 1:2 inclusion complexes are formed. ► At high CD concentration only 4% (6%) of the fluorophore are localized in the α-CD (β-CD) in the form of 1:2 complex. ► The time-resolved experiments gave more insight into the nature and structure of the studied inclusion complexes.