Ion-pair interaction in pyridinium carboxylate solutions

The Journal of Physical Chemistry. a
Erik R BergDarin J Ulness

Abstract

Ion-pair interactions between pyridinium cations and various carboxylate anions are explored using noisy light based coherent anti-Stokes Raman scattering (I(2)CARS). Binary mixtures of pyridine and various carboxylic acids (including halo-acetic acids, straight-chain carboxylic acids, and pivalic acid) are prepared. A Brønsted type acid-base reaction occurs in these mixtures to create pyridinium and carboxylate ions. Both pyridine, itself, and pyridinium have strong I(2)CARS signals originating from their ring breathing modes. The vibrational frequency of the ring breathing mode for pyridine is blue-shifted by hydrogen bonding, and that same mode for pyridinium is red-shifted by ion-pair interaction. Frequency shift data for the ring breathing mode of pyridine and pyridinium are presented. These data are discussed in terms of a simplistic model for the electronic behavior of these compounds.

References

Jan 1, 1997·Annual Review of Physical Chemistry·C L Perrin, J B Nielson
Jan 19, 2002·The Journal of Organic Chemistry·Peddy VishweshwarVincent M Lynch
Sep 17, 2004·Chemistry : a European Journal·Hans-Heinrich LimbachGleb S Denisov
Dec 15, 2006·The Journal of Physical Chemistry. a·Erik R BergDarin J Ulness

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Citations

Feb 20, 2009·Chemical Communications : Chem Comm·Lomary S MoonPrasad V Bharatam
Nov 10, 2009·The Journal of Chemical Physics·An Yong LiLi Juan Cao
Sep 10, 2018·The Journal of Chemical Physics·Nikhil P AravindakshanAllan L L East
Feb 6, 2009·The Journal of Physical Chemistry. B·Kristi L O'Neal, Stephen G Weber
Dec 4, 2009·The Journal of Physical Chemistry. a·Haiyan FanDarin J Ulness
Aug 10, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Aparna RoySumita Roy
Aug 14, 2010·The Journal of Organic Chemistry·Lomary S MoonRavinder S Jolly
Nov 28, 2012·The Journal of Physical Chemistry. a·Daniel B TurnerDarin J Ulness
Nov 11, 2021·Organic & Biomolecular Chemistry·Cornelis H M van der LooAdriaan J Minnaard

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