Modulation of Fluorescence Properties of DDQC in Microemulsions

ABSTRACT Steady‐state and time‐resolved fluorescence spectroscopy of 7‐(diethylamino)‐3‐(2,3‐dihydrofuro[3,2‐ c ]quinolin‐4‐yl)‐2 H ‐chromen‐2‐one (DDQC) in aerosol OT (AOT) microemulsion revealed that the DDQC molecule diffuses into the core water pool from the nonpolar region of the micelle. The present study highlights the diffusion of DDQC into the core water pool from the nonpolar region of the reverse micelle of AOT microemulsion using a detailed steady‐state and time‐resolved spectroscopic analyses. The formation of cationic species of DDQC inside the core of the reverse micelle was evidenced by the redshift in the absorption and emission spectra and the decrease in the fluorescence quantum yield from 0.4 to 0.12 with the increase in (ratio of water and surfactant concentration). Furthermore, fluorescence correlation spectroscopy (FCS) was used to probe the diffusion dynamics of DDQC into the water pool of the micellar environment at the single‐molecular level. The result ascertained that DDQC experienced a more constrained environment with increasing .