Journal of Solution Chemistry

, Volume 8, Issue 5, pp 395–409 | Cite as

Vibrational spectral studies of ion-ion and ion-solvent interactions. III. Zinc nitrate in water/acetonitrile mixtures

  • Yu-Keung Sze
  • Donald E. Irish
Article

Abstract

Raman and some infrared line parameters of Zn(NO 3 ) 2 /H 2 O/CH 3 CN systems spanning a range of both solute and mixed solvent compositions are reported. It is concluded that the first cosphere of the zinc cation contains H 2 O, CH 3 CN, and NO 3 , the relative amounts of which are dependent on the composition. From an intensity analysis the relative amounts of these species in the first cosphere have been obtained. As the CH 3 CN/H 2 O ratio increases, a signal at 2263 cm −1 , attributed to CH 3 CN in the second cosphere binding to water in the first cosphere, increases. For a solvent composition of 4 moles water to 1 mole acetonitrile, an ion-pair association constant for Zn 2+ (NO 3 ) of 0.090 M −1 (25°C) was measured. Evidence that the tetrahedral four-coordinate species [Zn(NO 3 ) 2 (CH 3 CN) 2 ] is the major constituent in acetonitrile-rich mixed solvents is presented.

Key words

Acetonitrile-water solvent systems mixed solvation zinc nitrate ion-pair formation 

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Copyright information

© Plenum Publishing Corporation 1979

Authors and Affiliations

  • Yu-Keung Sze
    • 1
  • Donald E. Irish
    • 1
  1. 1.Guelph-Waterloo Centre for Graduate Work in Chemistry, Waterloo Campus, Department of ChemistryUniversity of WaterlooWaterlooCanada

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