The complexation of acenaphthene and fluranthene with b-cyclodetrin (CD) in aqueous solution in the presence and absence of ethanol was investigated by means of the time-resolved fluorescence technique. The appearance of a longer lifetime component and the increase of its fraction relative to that of the shorter lifetime component with increasing CD concentration demonstrate the formation of inclusion complex between the guest mol. and CD. The formation constants for complexation were derived from the pre-exponential factor Ai, of fluorescence decay curves. The presence of ethanol in the reaction systems enhanced the inclusion to a large extent.

Key words: CYCLODEXTRIN, DIHYDRO-COMPOUNDS, FLUORESCENCE CHARACTERISTIC, COMPLEX CONSTANT, COMPLEX, FLUORANTHENE, ACENAPHTHENE P, TIME RESOLUTION CHARACTERISTIC