Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (7): 823-829.DOI: 10.11944/j.issn.1000-0518.2020.07.200079

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Influence of Sodium and Potassium Ions on Dihydrogen Phosphate Anion Raman Spectra

ZHANG Yanpinga,b, XUE Dongfenga,b,*   

  1. aState Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Acdemy of Sciences,Changchun 130022,China;
    bCollege of Applied Chemistry and Engineering,University of Science and Technology of China,Hefei 230026,China
  • Received:2020-03-19 Published:2020-07-01 Online:2020-07-07
  • Contact: XUE Dongfeng, professor; Tel:0431-85262294;; Research interests:multiscale crystallization of functional materials
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.51832007)

Abstract: Dihydrogen phosphate anion (H2PO-4) solution has important research value in biological buffering, molecular recognition and crystal growth. Taking KH2PO4 (KDP) and NaH2PO4 (NaDP) solutions as research objects, the influence of sodium and potassium ions on cluster aggregation and chemical bond vibration of H2PO-4 solution was studied by in situ micro-Raman spectra. It was discussed that the difference of monovalent ions (K+, Na+) and the concentration of the solution played an important role in the Raman shift variation and nucleation induction time of H2PO-4 vibration. The results show that the variation of Raman shift and the nucleation induction time increase with the increase of the solution-phase electronegativity of cations and the decrease of the concentration. In the Raman spectra, it is observed that the P(OH)2 and PO2 bands shift in the process of nucleation. It means that the cluster configuration is gradually stable and chemical bonding becomes clear, which deepens the understanding of solution structure and chemical bond during crystallization.

Key words: in situ Raman spectra, sodium ions, potassium ions, dihydrogen phosphate anion, solution crystallization, clusters, aggregation