La<sup>3+</sup> and Y<sup>3+</sup> interactions with the carboxylic acid moiety at the liquid/vapor interface [electronic resource] : Identification of binding complexes, charge reversal, and detection limits

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Tác giả:

Ngôn ngữ: eng

Ký hiệu phân loại: 630.1 Agriculture and related technologies

Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2021

Mô tả vật lý: Size: p. 2169-2180 : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 267673

 Specific interactions of yttrium and lanthanum ions with a fatty acid Langmuir monolayer were investigated using vibrational sum frequency spectroscopy. The trivalent ions were shown to interact with the charged form of the carboxylic acid group from nanomolar concentrations (<
 300 nM). Analysis of the spectral features from both the symmetric and the asymmetric carboxylate modes reveals the presence of at least three distinct coordination structures linked to specific binding configurations. Although the same species were identified for both La<
 sup>
 3+<
 /sup>
  and Y<
 sup>
 3+<
 /sup>
 , they display a different concentration dependence, highlighting the ion-specificity of the interaction. From the analysis of the response of interfacial water molecules, the reversal of the surface charge, as well as the formation of yttrium hydroxide complexes, were detected upon increasing the amount of salt in solution. The binding interaction and kinetics of absorption are sensitive to the solution pH, showing a distinct ion speciation in the interfacial region when compared to the bulk. Changing the subphase pH or adding a monovalent background electrolyte that promotes deprotonation of the carboxylic acid headgroup could further improve the detection limit of La<
 sup>
 3+<
 /sup>
  and Y<
 sup>
 3+<
 /sup>
  to concentrations <
  100 nM. These findings demonstrate that nM concentrations of trace metals contaminants, typically found on monovalent salts, can significantly influence the binding structure and kinetics in Langmuir monolayers.
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