钠和钾离子对磷酸二氢根拉曼光谱的影响

doi:10.11944/j.issn.1000-0518.2020.07.200079

摘要/Abstract

摘要： 磷酸二氢根(H₂PO^-₄)溶液在生物缓冲、分子识别、晶体生长等方面有着重要的研究价值。本文以KH₂PO₄(KDP)和NaH₂PO₄(NaDP)溶液为研究对象,利用原位微区拉曼光谱研究钠离子和钾离子对H₂PO^-₄溶液团簇聚合及化学键振动的影响,讨论单价阳离子(K⁺,Na⁺)的差异、溶液浓度对H₂PO^-₄拉曼位移变化和成核诱导时间的影响。结果表明,拉曼位移变化、成核诱导时间随阳离子溶液电负性的增加、浓度的降低而增大。在拉曼光谱中观察到P(OH)₂和PO₂振动峰在成核过程中发生偏移,表明由氢键作用导致的团簇构型逐渐稳定,化学键逐渐增强,深化溶液结晶过程中对溶液结构和化学键的理解。

关键词: 原位拉曼光谱, 钠离子, 钾离子, 磷酸二氢根, 溶液结晶, 团簇, 聚集

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

张艳平, 薛冬峰. 钠和钾离子对磷酸二氢根拉曼光谱的影响[J]. 应用化学, 2020, 37(7): 823-829.

ZHANG Yanping, XUE Dongfeng. Influence of Sodium and Potassium Ions on Dihydrogen Phosphate Anion Raman Spectra[J]. Chinese Journal of Applied Chemistry, 2020, 37(7): 823-829.

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