SCI和EI收录∣中国化工学会会刊

›› 2011, Vol. 19 ›› Issue (2): 212-216.

• THERMODYNAMICS AND CHEMICAL ENGINEERING DATA • Previous Articles     Next Articles

Theoretical Study of Hydration Effects on the Selectivity of 18-Crown-6 Between K+ and Na+

GUO Xiaojing, ZHU Yudan, WEI Mingjie, WU Ximing, LÜ Linghong, LU Xiaohua   

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China
  • Received:2010-11-09 Revised:2011-01-09 Online:2011-04-28 Published:2011-04-28
  • Supported by:
    Supported by the National Natural Science Foundation of China (20706029);the National Basic Research Program of China (2009CB623407,2009CB219902);Jiangsu Applied Chemistry and Materials Graduate Center for Innovation and Academic Communication foundation (2010ACMC03)

Theoretical Study of Hydration Effects on the Selectivity of 18-Crown-6 Between K+ and Na+

郭晓静, 朱育丹, 魏明杰, 吴喜明, 吕玲红, 陆小华   

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China
  • 通讯作者: LU Xiaohua,E-mail:xhlu@njut.edu.cn
  • 基金资助:
    Supported by the National Natural Science Foundation of China (20706029);the National Basic Research Program of China (2009CB623407,2009CB219902);Jiangsu Applied Chemistry and Materials Graduate Center for Innovation and Academic Communication foundation (2010ACMC03)

Abstract: A combination of molecular dynamics (MD) and density functional theory (DFT) calculations were used to study the hydration structures of K+ and Na+ ions under the confinement of 18-crown-6 in order to identify the role of water in the selectivity of 18-crown-6 towards K+.The radial distribution functions,coordination num-bers,orientation structures and interaction energies were analyzed to investigate the hydration of K+ and Na+ in 18-crown-6/cation complexes.All calculations of K+ and Na+ in bulk water were also conducted for comparison.The simulation results show that the orientation distributions of the water molecules in the first coordination shell of K+ are more sensitive to the confinement of 18-crown-6 than those of Na+.It is more favorable to confine a K+ in 18-crown-6 than a Na+ in terms of interaction energy.Good agreement is obtained between MD results and DFT results.

Key words: 18-crown-6, selectivity, molecular dynamics, density functional theory

摘要: A combination of molecular dynamics (MD) and density functional theory (DFT) calculations were used to study the hydration structures of K+ and Na+ ions under the confinement of 18-crown-6 in order to identify the role of water in the selectivity of 18-crown-6 towards K+.The radial distribution functions,coordination num-bers,orientation structures and interaction energies were analyzed to investigate the hydration of K+ and Na+ in 18-crown-6/cation complexes.All calculations of K+ and Na+ in bulk water were also conducted for comparison.The simulation results show that the orientation distributions of the water molecules in the first coordination shell of K+ are more sensitive to the confinement of 18-crown-6 than those of Na+.It is more favorable to confine a K+ in 18-crown-6 than a Na+ in terms of interaction energy.Good agreement is obtained between MD results and DFT results.

关键词: 18-crown-6, selectivity, molecular dynamics, density functional theory