Chemical Research in Chinese Universities ›› 2010, Vol. 26 ›› Issue (4): 656-661.

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Ab-initio Investigation on Ion-associated Species and Association Process in NaNO3 Solution

ZHANG Hao1, FENG Bo2, YU Jian-kang1* and SUN Chia-chung1   

  1. 1. State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130021, P. R. China;
    2. Institute of Condensed State Physics, Jilin Normal University, Siping 136000, P. R. China
  • Received:2010-03-26 Revised:2010-04-25 Online:2010-07-25 Published:2010-10-01
  • Contact: YU Jian-kang, E-mail: yujk@mail.jlu.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.20772048).

Abstract: Some ion-associated species existed possibly in NaNO3 solution were investigated via the ab-initio method. The hydrated ion parings, triple and multiple ion clusters in NaNO3 solution are all analogous to those in Mg(NO3)2 system except that the bi-dentate structures can not be formed. Only one solvent-shared ion paring has larger v1-NO3-  frequency than the hydrated NO3- ion. And all triple clusters with two hydrated Na+ ions and one NO3- have larger v1-NO3-  frequency than the hydrated NO3- ion. The ion association process in NaNO3 solution is predicted as free ions→solvent-separated ion pairings→solvent-shared ion pairings→solvent-shared triple ion clusters→contact triple ion clusters→contact multiple ion clusters→amorphous NaNO3, which is not analogous to that in MgSO4 but those in Mg(NO3)2 and Mg(ClO4)2 systems.

Key words: Quantum chemistry, Sodium nitrate, Ion-associated species, Association process