Interaction of charge transfer fluorescence probe with non-ionic surfactants: Estimation of physico-chemical properties and association constant

Abstract

KEYWORDSFluorescence behavior of intramolecular charge transfer probe trans-ethyl-p-(dimethylamino) cinnamate (EDAC) is extremely sensitive to the local environment. This study explores the interaction of EDAC with several Igepal, Brij and Tween series of non-ionic surfactants by steady state and picoseconds time-resolved fluorescence spectroscopy. The physico-chemical properties, like critical micelle concentration and micropolarity of the micellar media surrounding the probe were determined. In most of the cases, the observed values were in good agreement with the data reported in the literature. Results obtained from time-resolved fluorescence experiments show a substantial reduction in total nonradiative decay rate of the probe in micellar medium compared to that in aqueous phase. This indicates preferential association of the probe inside the micellar core. The association constant of the probe-micelle interaction was also evaluated in different cases.

Amphiphilic Fluorescent Well-Defined Living Polymer from Indole-3-Carboxaldehyde and 4-Bromo-1, 8-Naphthalic Anhydride: Synthesis and Characterization

“…As can be seen, after micelle formation, absorbance and fluorescence increase with concentration but with different rate. Such observations were reported earlier also [23].…”

Synthesis of amphiphilic poly(N‐vinylcaprolactam) using ATRP protocol and antibacterial study of its silver nanocomposite

“…There is continuous increase in absorbance before a certain point after which absorbance increases with different rate (Fig. 9), Singh and Mitra65 have also found such results. The CMC values reported by them were agreed with the literature data.…”

Photophysical Investigation of Styryl Dye in Ionic Liquid Micelles: Role of Micellar Polarity and Viscosity

“…2,38,39 The enhancement in fluorescence intensity can be attributed to the localization of DMASP in a less polar region within the IL micellar aggregates, mainly due to the reduction of nonradiative relaxation of DMASP within the confined micelle cavity. 44 TICT state is generated by the intramolecular rotation of the donor and acceptor groups of the molecule. In high-viscosity media, the probe intensity increases in terms of fluorescence due to restricted rotation.…”