Perturbations of water by alkali halide ions measured using multivariate Raman curve resolution

J Phys Chem B. 2009 Feb 19;113(7):1805-9. doi: 10.1021/jp808732s.

Abstract

Polarized Raman spectroscopy, combined with multivariate curve resolution (MCR), is used to measure the influence of dilute alkali halide ions on the OH stretch vibrational band of water. The frequency and integrated intensity of the resulting hydration shell OH bands are found to increase with increasing anion size. Comparisons of results obtained from salt solutions in H(2)O and HOD/D(2)O imply that ion-water interactions reduce the influence of resonance coupling on the OH stretch band of H(2)O. Polarized Raman results indicate that the hydration shell of F(-) gives rise to a nearly perfectly polarized OH stretch band, while large anions produce larger depolarization.

MeSH terms

  • Halogens / chemistry*
  • Ions / chemistry
  • Metals, Alkali / chemistry*
  • Spectrum Analysis, Raman / methods*
  • Vibration
  • Water / chemistry*

Substances

  • Halogens
  • Ions
  • Metals, Alkali
  • Water