Steady state and time-resolved fluorescence spectroscopy of quinine sulfate dication in ionic and neutral micelles: Effect of micellar charge on photophysics

摘要: Steady state and time-resolved fluorescence studies have been carried out to investigate the effects of micellar surface charge on photophysics a well known fluorescent molecule quinine sulfate dication (QSD) in cationic, cetyltrimethylammonium bromide (CTAB), anionic, sodium dodecylsulphate (SDS) neutral, triton X-100 (TX100) surfactants at concentrations above critical micelle (c.m.c) aqueous phase. Edge excitation red shift (EERS) maximum QSD has observed all surfactant solutions studied. The magnitude EERS is less anionic SDS solution compared CTAB TX100 surfactants. almost same as bulk water solution. ascribed terms solvent relaxation process. multi-exponential decay due different locations systems. In system, heterogeneous restricted motion molecules rate decreases which results decrease net components fit three exponentials. Following two step wobbling cone model for analysis temporal anisotropy micelles allows determination restriction fluorophore. Further, we shown that extraordinary capability sense surrounding environment makes very efficient interface can also be used probe mobility around excited molecules.