Revival of the nearly extinct fluorescence of coumarin 6 in water and complete transfer of energy to rhodamine 123

Abstract

The nearly extinct fluorescence of coumarin 6 in water due to microcrystal formation is revived by micelles. Practically complete transfer of energy from coumarin 6 to rhodamine 123 through resonance energy transfer could be achieved.

Piecemeal Rekindling of Coumarin 6 Fluorescence on Stepwise Unfolding of Protein by Surfactant

“…The fastest decaying component is assigned to the C6 aggregates and the slowest one is for the C6 monomer. 18 With an increase in BSA concentration in the aqueous environment, the excited state lifetime of the aggregates gradually decreases along with reduction in the contribution, and a slower component of 2.55 ns evolves that gradually increases in magnitude and contribution. The slower component differs from the normal lifetime of the C6 monomer and hence is attributed to some bound state of C6 composites with BSA.…”

“…It is known that C6 aggregates interact with SDS in water, resulting in the disintegration into molecular entities on micelle formation. 18 Figure 7 provides the selected decay traces for the interaction of C6 with SDS, and Table 3 provides the lifetime data. A growth component due to ESICT in C6 appears after the cmc is reached, concluding the incorporation of C6 molecules.…”

“…It has been observed that the emission can be revived by disintegrating the stacks inducing hydrophobic interaction by applying an external host. 17,18 Albumins actively participate in transporting drugs, fatty acids, hormones, etc. These proteins are actively involved in the maintenance of colloid-blood pressure and transfer of ligands across liver, intestine, kidney, and brain interfaces.…”

“…Herein, we have used a popular laser dye, coumarin 6 (C6), to serve a dual purpose. C6 readily forms microcrystals in an aqueous solution (Figure S1), leading to profuse loss in its fluorescence and molecular functionality. − The C6 molecules undergo stacking, which negatively affects the charge transfer emission. It has been observed that the emission can be revived by disintegrating the stacks inducing hydrophobic interaction by applying an external host. , …”

Electrochemistry and Electrochemiluminescence of Coumarin Derivative Microrods: Mechanism Insights

“…Coumarin and its derivatives are well-known organic compounds used as photoluminescence probes, − electroluminescence (EL) emitters in organic light-emitting diodes (OLEDs), and laser dyes due to merits of high PL quantum yields, reasonable photostability, ease to synthesize, and commercial availability. , Several ECL systems based on coumarin derivatives have been developed including coumarin 30, donor-substituted phenylethynylcoumarins, coumarin-modified oxazaborines, hydroxyl- or amino-substituted methyl coumarin, and donor–acceptor (D–A) conjugated molecule 6-[4-( N , N -diphenylamino)­phenyl]-3-ethoxycarbonyl coumarin-based nanomaterials . Despite remarkable properties and extensive use, there were few reports on the ECL of nanomaterials based on insoluble coumarin derivatives in aqueous solutions.…”