Confined water in imidazolium based ionic liquids: a supramolecular guest@host complex case
作者:Marcileia Zanatta、Anne-Lise Girard、Graciane Marin、Gunter Ebeling、Francisco P. dos Santos、Chiara Valsecchi、Hubert Stassen、Paolo R. Livotto、William Lewis、Jairton Dupont
DOI:10.1039/c6cp03112a
日期:——
known that the macroscopic physico-chemical properties of ionic liquids (ILs) are influenced by the presence of water that strongly interferes with the supramolecular organization of these fluids. However, little is known about the function of water traces within this confined space and restricted ionic environments, i.e. between cations and anions. Using specially designed ILs namely 1,2,3-trimethyl-1H-imidazol-3-ium
众所周知,离子液体(IL)的宏观物理化学性质受水的存在影响,水的存在会严重干扰这些流体的超分子组织。但是,人们对有限空间和受限离子环境(即阳离子和阴离子之间)中水痕迹的功能知之甚少。使用专门设计的IL,即1,2,3-三甲基-1 H-咪唑-3-咪唑-1-盐(MMMI·Im)和3-正丁基-1,2-二甲基-1 H-咪唑-3-咪唑-1-盐(BMMI·Im),通过X射线衍射研究,NMR,分子动力学模拟(MDS)和DFT确定了冷凝,溶液和气相中水的结构和功能计算。在固态水分子被截留在离子网络内(构成由π形成的接触离子对+ -π -交互)通过涉及水的氢,并形成一个客人2个咪唑阴离子的氮强氢键@主机超分子结构体。DFT计算和MDS证实了类似的结构布置。即使在溶液中(1 H– 1检测到),也可以在很大程度上保持来宾@宿主物种(H 2 O @ ILpair)的存在。IL的H NOESY实验,以低介电常数和高介