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Investigation of Phosphonic Acids Based on Raman and Surface-Enhanced Raman Spectroscopy.

Linus Pauling F Peixoto1,2, Bismark N da Silva1, Regina D E Carvalho1

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Summary

This study characterizes phosphonic acids like amino tris-(methylenephosphonic acid) (ATMP) and diethylenetriamine penta-(methylenephosphonic acid) (DTPMP) using DFT and SERS. The findings support SERS as a viable method for detecting these environmentally concerning compounds in water.

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Area of Science:

  • Environmental Chemistry
  • Spectroscopy
  • Computational Chemistry

Background:

  • Phosphonic acids (ATMP, DTPMP) are widely used but pose environmental risks due to slow degradation.
  • Monitoring these compounds in aquatic environments is crucial for environmental protection.
  • Vibrational characterization of these phosphonic acids is not well-documented.

Purpose of the Study:

  • To provide a comprehensive vibrational characterization of ATMP and DTPMP.
  • To assess the utility of Raman and SERS spectroscopy for detecting these compounds.
  • To correlate theoretical calculations with experimental spectroscopic data.

Main Methods:

  • Density Functional Theory (DFT) calculations for theoretical spectra.
  • Raman and Surface-Enhanced Raman Spectroscopy (SERS) experiments.
  • Analysis and assignment of vibrational spectra.

Main Results:

  • Theoretical DFT spectra showed good agreement with experimental Raman/SERS spectra.
  • Vibrational assignments were consistent with known data for similar organic structures.
  • SERS successfully detected both ATMP and DTPMP at concentrations as low as 50 ppm.

Conclusions:

  • DFT and SERS are effective tools for the vibrational analysis of phosphonic acids.
  • SERS offers a sensitive method for monitoring ATMP and DTPMP in environmental samples.
  • This work provides essential spectral data for identifying and quantifying these compounds.