The complex is formed in an aqueous solution system of N－methylpyrrolidone(NMP) and lithium chloride. To scientifically develop the separation technology of this kind of solution system，a detailed study of the characteristics of these complex is quite necessary. However，the structure of this kind of complex has not been reported until now. In this study，the structure of this complex from a sample of the industrial wastewater was characterized initially by 1H NMR spectroscopy. The conditions of forming this complex was simulated and the same complex was successfully synthesized by our experiments. Then，the single crystals of the complex suitable for X－ray diffraction measurements were grown in the mixed solution of CH3OH and CH3CN with the volume ratio of 1∶1 and obtained by slow evaporation in air at low temperature. The analysis of the single－crystal indicates that this complex is constituted by two lithium ions，two NMP molecules，four coordinated water molecules and two chloride ions，showing a distorted tetrahedral configuration. Among them，the distance between the centers of two lithium ions is 2.737(9)，and the related Li－O bond lengths are 1.903(5)，1.929(5) and 1.960(5)，respectively. In addition，the decomplexation method of the NMP－LiCl－H2O complex system has also been explored by experiments in this study.
Gao Ziya，Wang Baorong，Zhou Zheng，Zheng Limin，Zhang Zhibing*.
Structure and decomplexation study of NMP－LiCl－H2O complex[J]. Journal of Nanjing University(Natural Sciences), 2018, 54(4): 672
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