Das Koyeli, Datta Biswajit, Rajbanshi Biplab, Roy Mahendra Nath
Department of Chemistry, University of North Bengal , Darjeeling 734013, West Bengal, India.
J Phys Chem B. 2018 Feb 8;122(5):1679-1694. doi: 10.1021/acs.jpcb.7b11274. Epub 2018 Jan 24.
The interface between pyrrolidinium-based ionic liquid, i.e., 1-ethyl-1-methylpyrrolidinium bromide, with β-cyclodextrin and 18-crown-6 solution have been compared and explored by means of density, viscosity, refractive index, electrical conductance and surface tension, FTIR, H nuclear magnetic resonance, 2D ROESY NMR, and high resolution mass spectroscopy studies. Limiting apparent molar volumes (ϕ), experimental slopes (S) interpreted in terms of inclusion and interaction (ion-solvent, ion-ion). Establishment of binding affinity were discussed in molecular terms supported this inclusion complexation and encapsulation interaction process. The result shows that the stability of the resulting complexes of β-cyclodextrin:[EMPyrr] and 18-crown-6:[EMPyrr] is based on the geometrical and spectrometric data. Host guest chemistry of the five-membered nitrogen containing cation with two different macro cyclic hosts is supported by studying NMR. HRMS has been used to support the complexation process with the proper stoichiometry ratio. The solid complex formations were established by Fourier transform infrared study.
通过密度、粘度、折射率、电导率和表面张力、傅里叶变换红外光谱（FTIR）、氢核磁共振、二维旋转坐标系相关光谱（2D ROESY NMR）以及高分辨率质谱研究，对基于吡咯烷鎓的离子液体（即1-乙基-1-甲基吡咯烷鎓溴化物）与β-环糊精和18-冠-6溶液之间的界面进行了比较和探索。极限表观摩尔体积（ϕ）、根据包合和相互作用（离子-溶剂、离子-离子）解释的实验斜率（S）。在分子层面讨论了结合亲和力的建立，支持了这种包合物络合和包封相互作用过程。结果表明，β-环糊精:[EMPyrr]和18-冠-6:[EMPyrr]所得络合物的稳定性基于几何和光谱数据。通过研究核磁共振支持了含氮五元阳离子与两种不同大环主体的主客体化学。高分辨率质谱已用于支持具有适当化学计量比的络合过程。通过傅里叶变换红外研究确定了固体络合物的形成。
