Absorption, fluorescence and resonance Rayleigh scattering spectra of hydrophobic hydrogen bonding of eosin Y/Triton X-100 nanoparticles and their analytical applications

Abstract

In a weak acidic medium (pH 2.4-2.8), eosin Y molecules (H 2 L) could replace water molecules to associate with Triton X-100 to form hydrophobic hydrogen bonding complexes. These complexes could further aggregate to form nanoparticles through the squeezing action of the water phase and Van Der Waals force, resulting in changes in the absorption spectrum and fluorescence quenching of EY as well as the significant enhancement of resonance Rayleigh scattering. This enables the sensitive determination of Triton X-100 using the fading spectrophotometry, fluorescence quenching method and RRS method. Among them, the RRS method shows the highest sensitivity with a detection limit of 20.6 ng mL 1 for Triton X-100. The optimum experimental conditions and factors that affect the absorption, fluorescence and RRS spectra were tested. The effects of coexisting substances were investigated and the results showed good selectivity. Based on these results, new spectrophotometric methods, fluorescence quenching method and RRS method for the determination of Triton X-100, were established. The hydrogen bonding association of eosin Y with Triton X-100 and the formation of nanoparticles as well as their effects on related spectral characteristics were discussed utilizing infrared, transmission electron microscope technique and quantum chemical method. eosin Y, Triton X-100, resonance Rayleigh scattering, fluorescence quenching, absorption spectrum

Resonance Rayleigh scattering and resonance nonlinear scattering methods for the determination of nicardipine hydrochloride using eosin Y as a probe

“…It was shown that the ionassociation complex was not a simple mixture of the reactant and the ion association reaction was happened. Moreover, comparing curve b with curve d, we observed that the absorption peaks in 1092 cm À1 and 1243 cm À1 belonging to the g O-H of phenolic hydroxyl in EY were disappeared, 29 and the characteristic absorption peak in 1214 cm À1 was observed which could be attributed to the g O-H of carboxyl in EY, 25 these demonstrate that the HNCD + bound with -O À to form a neutral ionassociation complex. 30 The structural characteristics such as shape and size of the reactants and product were observed by TEM.…”

Resonance Rayleigh scattering spectra of Cu2+–adenine–WO42− system and its analytical application

“…Therefore, it is concluded that this electroneutral ionassociation has strong hydrophobicity, and they get close via squeezing effect of aqueous phase and self-aggregate by van der Waals force. [44][45][46][47] The procedure is shown as follows: a Tolerance level was calculated using mg mL À1 .…”

Resonance Rayleigh scattering method for determination of 2-mercaptobenzothiazole using gold nanoparticles probe

“…This method showed its high potential for the determination of metal ions [31], non-metallic inorganic substances [32,33], surfactants [34], biomacromolecules [35], and pharmaceuticals [36]. The method is characterized by high sensitivity, convenience in performance and simplicity in apparatus (usually common spectrofluorophotometer).…”