摘要
N-甲基吡咯烷酮(NMP)与氯化锂的水溶液体系会形成配合物,研究该体系配合物的特征对于制定科学的分离方法十分重要.迄今为止,还没有关于此类配合物具体结构的相关研究报道.通过核磁共振氢谱对其结构进行初步表征,并模拟该配合物产生的条件,成功地合成了该配合物进一步使用甲醇-乙腈作为混合溶剂,采用低温挥发法获得了适合于X射线衍射的单晶.单晶结构数据显示该配合物由两个金属锂离子、两个NMP分子、四个配位水以及两个氯离子组成,呈现畸变的四面体构型.其中,两个锂离子中心的距离为2.737(9),相关的Li-O键长分别是1.903(5),1.929(5)和1.960(5).此外,还尝试对该配合物的解络方法进行了探究.
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 1 H 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 CH_3OH and CH_3CN 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-H2 O complex system has also been explored by experiments in this study.
出处
《南京大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第4期672-679,共8页
Journal of Nanjing University（Natural Science）
基金
国家自然科学基金(21476105
91634104
91434101
21776122)
关键词
N-甲基吡咯烷酮
单晶结构
核磁共振氢谱
解络
N-methylpyrrolidone
single-crystal structure
1H NMR spectroscopy
decomplexation
