钠和钾离子对磷酸二氢根拉曼光谱的影响  

Influence of Sodium and Potassium Ions onDihydrogen Phosphate Anion Raman Spectra

作　　者：张艳平 薛冬峰[1,2] ZHANG Yanping;XUE Dongfeng(State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Acdemy of Sciences,Changchun 130022,China;College of Applied Chemistry and Engineering,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院长春应用化学研究所,稀土资源利用国家重点实验室,长春130022 [2]中国科学技术大学,应用化学与工程学院,合肥230026

出　　处：《应用化学》2020年第7期823-829,共7页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(51832007)资助。

摘　　要：磷酸二氢根(H 2 PO 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KH 2 PO 4(KDP)和NaH 2 PO 4(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H 2 PO 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H 2 PO 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PO 2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。Dihydrogen phosphate anion(H 2 PO-4)solution has important research value in biological buffering,molecular recognition and crystal growth.Taking KH 2 PO 4(KDP)and NaH 2 PO 4(NaDP)solutions as research objects,the influence of sodium and potassium ions on cluster aggregation and chemical bond vibration of H 2 PO-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 H 2 PO-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 PO 2 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.

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 

分 类 号：O641.2[理学—物理化学]