Extensive applications of ionic liquids (ILs) may result in their accumulation in the ecological environment and organisms. Although ILs are popularly called “green solvents”, their toxicity, in fact, has been exhibited. Therefore the interaction of ILs with biomolecules is a cutting-edge research subject. Herein, the interactions of 1-butyl-3-methylimidazolium carboxylate ionic liquids ([C4mim][HCOO], [C4mim][CH3COO] and [C4mim][CH3CH2COO]) with glucose in water were studied for their volumetric properties, viscosity, conductivity and NMR spectra. Limiting apparent molar volumes (V0Φ,IL), viscosity B-coefficients, limiting molar conductivities (Λ0) and Walden products (Λ0η0) were evaluated for the ILs in glucose + water solutions. Volumetric interaction parameters were also obtained from the transfer volumes of the ionic liquids. The contributions of the solvent properties (B1) and the ionic liquid–solvent interactions (B2) to the B-coefficient were extracted, together with molar activation energies (Δμ0≠IL) of the ionic liquids for viscous flow of the aqueous glucose + IL solution. In addition, the 13C and 1H NMR spectra of methyl β-D-glucopyranoside and ILs in β-D-glucopyranoside + IL + D2O were studied. The NMR results show that no special and strong interactions were observed between glucopyranoside and the ILs. However, it was confirmed that the H2 on the imidazolium ring has more activity (acidity) than atoms H4 and H5. The macro-properties and their changes were also discussed in terms of the size, structure and solvation of the ILs and glucose.
离子液体(ILs)的广泛应用可能会导致其在生态环境和
生物体内积累。虽然
离子液体被普遍称为 "绿色溶剂",但事实上其毒性已经显现。因此,IL 与
生物大分子的相互作用是一个前沿研究课题。本文研究了 1-丁基-3-甲基
咪唑羧酸盐
离子液体([C4mim][HCOO]、[C4mim][CH3COO]和[C4mim][CH3CH2COO])与
葡萄糖在
水中的相互作用,包括它们的体积特性、粘度、电导率和核磁共振光谱。评估了
葡萄糖 +
水溶液中的 IL 的极限表观摩尔体积 (V0Φ,IL)、粘度 B 系数、极限摩尔电导率 (Λ0)和瓦尔登积 (Λ0η0)。还从
离子液体的转移体积中获得了体积相互作用参数。提取了溶剂特性(B1)和
离子液体-溶剂相互作用(B2)对 B 系数的贡献,以及
离子液体在
葡萄糖+IL
水溶液粘性流动中的摩尔活化能(Δμ0≠IL)。此外,还研究了 β-D-Glucopyranoside + IL + D2O 中甲基 β-D-Glucopyranoside 和 IL 的 13C 和 1H NMR 光谱。核磁共振结果表明,在
吡喃
葡萄糖苷和 IL 之间没有观察到特殊和强烈的相互作用。不过,经证实,
咪唑环上的 H2 比 H4 和 H5 原子具有更强的活性(酸性)。此外,还从 ILs 和
葡萄糖的大小、结构和溶解度方面讨论了它们的宏观特性及其变化。