[논문]Preferential solvation bromophenol blue in water-alcohol binary mixture

Dangui, Anayana Z.; Santos, Vanessa M.S.; Gomes, Benhur S.; de Castilho, Taiane S.; Nicolini, Keller P.; Nicolini, Jaqueline

doi:10.1016/j.saa.2018.05.087

[해외논문] Preferential solvation bromophenol blue in water-alcohol binary mixture

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, v.203, 2018년, pp.333 - 341

Dangui, Anayana Z. (Corresponding author.) , Santos, Vanessa M.S. , Gomes, Benhur S. , de Castilho, Taiane S. , Nicolini, Keller P. , Nicolini, Jaqueline

Abstract ▼ AI-Helper

Abstract In this study, the perichromic behavior of bromophenol blue (BPB) in various binary solvent mixtures was investigated. The binary mixtures considered were comprised of water and methanol (MeOH), ethanol (EtOH), n-propanol (n-PrOH), isopropanol (iso-PrOH) or t-butanol (t-BuOH). The investigation of a preferential solvation model that considers the addition of small quantities of alcohol to water in the presence of bromophenol blue (BPB) is described in this paper. The data obtained were employed to study the preferential solvation (PS) of the probe. It was observed that with increases in the molar fraction of water the spontaneity of the system decreases. This can be explained by the high solubility of BPB in ethanol, with ∆G > 0 at higher wavelengths (region rich in water with violet solution) and ∆G < 0 at lower wavelengths (region rich in alcohol with yellow solution). The pK of the binary mixture changed in all solvents and for all ratios, and the higher the water ratio is the lower the pKIn will be. In binary mixture, an increase in the hydrogen bond acceptor (HBA) nature of the solvents tested resulted in a bathochromic effect on the absorption band of BPB (Δλ = 12 nm). All of the data obtained showed a good nonlinear fit with the mathematical model (SD ≤ 6.6 × 10−3), suggesting that BPB has other potential applications besides its use as a pH indicator. Highlights The indicator showed a spectroscopic response in the preferential solvation. BPB showed sensitivity toward changes in the presence of different alcohols. These results propose new perspectives about the use of BPB. BPB can be used as perichromic dye in alcoholic medium. Graphical Abstract [DISPLAY OMISSION]

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[해외논문] Preferential solvation bromophenol blue in water-alcohol binary mixture

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