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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Editor-in-Chief: Rademann, Klaus

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Volume 225, Issue 6-7


Precise Analysis of Small Wavenumber Shift of Pyridine on Dilution with H2O and D2O Using RDS Technique

Shivangi Mishra / Tobias Meyer / Jürgen Popp / Ranjan K. Singh
Published Online: 2011-02-25 | DOI: https://doi.org/10.1524/zpch.2011.0080


The wavenumber difference (Δν) of the ring breathing mode (ν1), ring deformation mode (ν12) and C–H stretching mode (ν3) of pyridine (Py) dissolved in both H2O and D2O at equal mole fractions of the solute (Py) and the solvent (H2O/D2O) has been determined precisely by using the technique of Raman difference spectroscopy (RDS) in order to analyze the relative shift caused by these two solvents. The spectra of the two systems, for which the difference spectrum is to be generated, were recorded simultaneously and the wavenumber shifts up to almost one hundredth part of the linewidth of a band could be determined precisely. The values of Δν for the three modes as a function of mole fraction are compared with the Δν obtained by the solvation of Py molecule in the media of dielectric constants equal to that of the mixture of Py and H2O/D2O at the experimental mole fractions using DFT and MP2 methods. The variation in Δν with mole fraction seems to be the result of difference of dielectric constants of Py+H2O and Py+D2O at equal mole fraction. The absolute peak position and linewidth of the three modes as a function of mole fraction have been discussed in terms of relevant models, which show the effective role of diffusion and concentration fluctuation in the mixture.

Keywords: Raman Difference Spectroscopy; Relative Shifts; Deuterated Solvents; Pyridine; Ring Breathing Mode

About the article

* Correspondence address: Banaras Hindu University, Department of Physics, Varanasi 221005, Indien,

Published Online: 2011-02-25

Published in Print: 2011-07-01

Citation Information: Zeitschrift für Physikalische Chemie, Volume 225, Issue 6-7, Pages 673–690, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1524/zpch.2011.0080.

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