Abstract
The apparent formation constant calculated for the Q-cyclodextrin/acridine (Q-CD/ACR) complex (287 M -1 ) reveals a weak association in aqueous solution. An additional weakening of the binding strength between Q-CD and ACR, and subsequent reduction in the previously reported quenching of ACR caused by Q-CD, is observed upon interaction of the complex with selected straight-chain and branched alcohols. Nuclear magnetic resonance data suggest that the equilibrium involves the formation of ternary complexes. This equilibrium apparently leaves a greater number of ACR species accessible to the bulk aqueous environment, resulting in a consequent decrease in the total amount of ACR quenched
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