Article

Effect of β-cyclodextrin on intramolecular charge-transfer emission of 4-aminophthalimide

School of Chemistry, University of Hyderabad, Hyderabad 500 134 India
Journal of Photochemistry and Photobiology A: Chemistry DOI:10.1016/1010-6030(92)85212-D pp.185-192

ABSTRACT Steady state and time-resolved studies on the fluorescence of 4-aminophthalimide (AP) in aqueous β-cyclodextrin (CD) solutions are reported. A blue shift of the fluorescence maximum, enhancement of the fluorescence quantum yield and increase in the lifetime of the emitting intramolecular charge-transfer state are observed on addition of CD to an aqueous solution of AP. It is suggested that the elimination of water molecules from the surrounding of the fluorescent probe, as a result of encapsulation, leads to the changes in the photophysical properties. The formation constant of the complex is estimated from the pre-exponential factors of the biexponential decay of the fluorescence and is found to agree reasonably well with that obtained from fluorescence intensity measurements.

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Keywords

aqueous solution
 
aqueous β-cyclodextrin
 
biexponential decay
 
blue shift
 
emitting intramolecular charge-transfer state
 
fluorescence
 
fluorescence intensity measurements
 
fluorescence maximum
 
fluorescence quantum yield
 
fluorescent probe
 
formation constant
 
photophysical properties
 
Steady state
 
time-resolved studies
 
water molecules
 

T Soujanya